Teardrop forward assist

AR/M4 Vintage ARs
1

I have one of the first AR-15-A2 Colt rifles that still used A1 receivers, the forward assist is round
and I would like to replace w/original Colt teardrop unit.
Know where I can find one in stock ?

2

https://www.m4carbine.net/showthread.php?100661-The-Official-Where-Can-I-Get-It-Thread/page518