My 904 pulled from a 318 question
Go get a Harbor Freight, buy a $100 welder, look for converter weights at a trans shop,with blank stares on their faces, choose a spot to hopefully weld them on in the right place, install trans, uninstall trans because everything is out of balance, install, uninstall, start a 10 page thread about vibration under car, uninstall...............
Or
Buy the B&M plate (got mine for $50.00) install, burn rubber.
Case closed.