I was planning on putting the Tarrett $99 60mm shift risers on my car, but was scrolling through McMaster Carr looking for something else, and I came across these. https://www.mcmaster.com/98952A443/ at $5.80 per. They're only 51 MM, but fit perfectly.


51 mm standoffs M6 thread mail and female

 

Nice, I made my own for about $1.50 each. No way I was paying $100, that cuts into my beer money

 

I ran something similar for about 1.5 seasons. It worked, but I'd be lying if I said I didn't prefer the rennline angled shift riser. The 4" one is perfect height for me.