Try here:
https://www.m3post.com/forums/showpo...6&postcount=49
I know from personal experience these clamps work on an OEM exhaust.
https://www.summitracing.com/parts/sum-672325
If you just need the clamp, these MAY fit, they are a 2.5" ball/socket clamp.
https://www.summitracing.com/parts/w...8aAsQGEALw_wcB