My first suggestion would be Watson. But you may want to try Livernois Engineering in Dearborn Heights since Watson is booked. Livernois also does exhaust fabrication for the automotive industry. They have a walk-in motorsports parts office at their Gulley Road offices. I have purchased some things from them, not the cheapest. But Watson will not be cheap either.
Does anyone have any suggestions on an automatic transmission shop in SE Michigan? I may have to repost this Q outside this thread!
Good Luck,
Glenn