[Kracka]

I always used to get mine at Checker and Autozone, I'd take a ruler back to their gasket boxes and start digging around until I found a 3", I recommend you do the same at whatever parts store is near you. I think the 3" I needed ended up being some old Ford diesel pickup. If for some reason that doesn't work, just order them online from one of the big DSM vendors (or maybe one of our board sponsors).