I'm replacing an Astabula Crank that I have on my Vintage Sears 10-speed. I was wondering if the bb shell of the frame is threaded. If not, do I have to buy an adapter for the shell? A friend of mine gave me a pretty much brand new Truvativ Square LE BB-07 108mm, and I was wondering if I can just put it on and it'll be fine, or do I need an English to Euro conversion?