Setobrick

LEGO part 78666: Brick Curved 2 x 1 with Inverted Cutout

Bricks Curved26 colours375 sets

LEGO part LEGO part 78666: Brick Curved 2 x 1 with Inverted Cutout

Specifications

Reference78666
CategoryBricks Curved
MaterialABS plastic
Colours26
Sets375
Listed pieces1,875
First appearance2021
Latest appearance2026
Element (Reddish Brown)6365885
Most common colourReddish Brown
Main themesFriends, City, Disney
SetopediaData: Rebrickable
Spec sheet updated on 2026-09-29

LEGO part 78666, Brick Curved 2 x 1 with Inverted Cutout, belongs to the Bricks Curved category. It exists in 26 colours and appears in 375 sets of our database, from 2021 to 2026, for a total of 1,875 listed pieces. Its most common colour is Reddish Brown.

Number 78666 identifies the shape and is moulded under the part. Each colour also has its own element ID, the one Pick a Brick uses: in reddish brown, it is 6365885.

Part 78666 through the years

The oldest set in our database that contains part 78666 is 10294 Titanic, released in 2021 in the Icons theme. It is still in use: the most recent set featuring it, 75425 Mos Eisley Cantina, dates from 2026.

Its peak year is 2025, with 106 sets containing it. The set with the most copies is 910042 Lost City: 60 copies, against an average of 5 per set.

It is spread across several themes, led by Friends (9%), City (7%) and Disney (7%). With 375 sets, it ranks no. 449 of 2,731 parts in our database and no. 27 of 96 in the Bricks Curved category.

Sets containing part 78666, by period

PeriodSets
20215
202234
202356
202484
2025106
202690

Colours of part 78666

5 colours appear in only one set: warm pink (42691 Garden Restaurant), medium azure (60506 Classic Beach Tram), light aqua (31156 Tropical Ukulele), coral (42666 Cat Birthday Party & Tree House) and light nougat (76469 Dobby the Free Elf).

Colour (element ID)SetsPiecesExample sets
Reddish Brown636588571325103051031671767
White6550186 · 634661671270717677538710294
Black636957866235103057690911021
Tan638329544174764021030875330
Red636957738123769061102076423
Light Bluish Gray639679131209103051031675325
Dark Turquoise64313321857311437625580119
Bright Light Blue63830911443213337647031385
Green639978812509100584302745829
Yellow64259741229603727215275455
Medium Nougat649971311429100627215143011
Bright Light Orange63921661021311327535743013
Orange64313331018311434330042686
Dark Bluish Gray6501468923721531137276339
Dark Blue6554234 · 6484600858721657725340913
Bright Light Yellow6380628842432074328511040
Dark Orange64826927544263191005875430
Blue6523962644721537647080120
Dark Red6364637616102941030477077
Bright Green6404619512714113114343239
Sand Green6608653 · 6430613274330275577
Warm Pink658482411042691
Medium Azure65553101860506
Light Aqua64745291231156
Coral65416541242666
Light Nougat66050441176469

Where to buy part 78666

Setopedia shows no prices: they vary by colour, condition and seller. Amazon links are affiliate links.

Search part 78666 on AmazonPick a Brick (lego.com)BrickLink entryRebrickable entry

Sets that include part 78666

Sets ranked by popularity that include at least one part 78666, in any colour.

Often found with part 78666

Parts that share the most sets with part 78666, based on set inventories.

More parts in the Bricks Curved category

All parts in the Bricks Curved category

Frequently asked questions

How many LEGO sets include part 78666?

Part 78666 (Brick Curved 2 x 1 with Inverted Cutout) appears in 375 sets listed on Setopedia, from 2021 to 2026, in any colour.

Which LEGO set contains the most copies of part 78666?

Set 910042 Lost City, released in 2025, contains 60 copies, the highest count in our database. On average, a set containing part 78666 has 5.

Which colours does LEGO part 78666 come in?

26 colours are listed for part 78666. The most common is Reddish Brown, found in 71 sets.

What is the rarest colour of part 78666?

According to our inventories, it is light nougat, found in only 1 set (76469 Dobby the Free Elf).

What is the element ID of part 78666 in reddish brown?

In reddish brown, part 78666 has element ID 6365885. Number 78666 is the mould number, the same for every colour.

Is LEGO part 78666 still used in recent sets?

Yes: it appears in sets released in 2026, such as 75425 Mos Eisley Cantina.

Where can I buy LEGO part 78666 individually?

Single parts 78666 can be ordered on Pick a Brick (lego.com) in colours currently produced, or on BrickLink for older colours. The part is also included in the sets listed on this page.