Thanks T-Fanz
A little further search turns up this Plarail Advance set with these. Looks like there should be yellow and black stickers for those square pegs.
![[Image: 1018p6558a.jpg]](https://s15.postimg.cc/r71cv9z9z/1018p6558a.jpg)
![[Image: 18p6558a.jpg]](https://s15.postimg.cc/ya98axmpz/18p6558a.jpg)
![[Image: Untitd.jpg]](https://s15.postimg.cc/nao0zam07/Untitd.jpg)
A little further search turns up this Plarail Advance set with these. Looks like there should be yellow and black stickers for those square pegs.
![[-]](https://www.blueplastictracks.org/images/collapse.png)