Where can I get tires for a 1976 Cosworth, I understand they are BR70-13 radials. I'd like some good performance tires if I can find them somewhere. Thanks to all for this great web site.

I am looking for a 5 speed manual transmission for my 1976 Cosworth. It has a 4 speed with 4:10 ratio so I'd like the overdrive.

What would be a good size exhaust on a 1976 Cosworth ? I plan on removing the catalytic converter and put a high flow muffler. Is 2" a good size for this 4 cylinder? or 2 1/4 or 2 1/2?