Ahhhhh. I'm converting a '71 U-08 right now and it's been a PAIN to say the least. If the serial # is intact on the bb you can date your bike and then search online and determine for the most part what size parts you will need. If it's early 70's like mine, good luck. The most important aspects of your frame are the bottom bracket and headset, because they are unique to older french bikes and VERY hard to find or VERY expensive when you do. The outer chainring attaches to the crank spider, and the inner attaches to the outer, so good luck getting rid of it. I'm going to space mine in a few mm and respace and redish teh rear wheel to get my chainline right. My cranks still spin smooth and true so I'm a little leary of removing the cotter pins and taking the cranks off. Other than that, I found a 22.0 mm stem on ebay for $20 and a set of belleri road drops with a 25.4 mm clamp diameter for $3 (score). Amazingly the seatpost diameter is also random, under 25.4, and also amazingly jensonusa.com carries a plain silver alloy post with a 25 mm diameter. I'm sooooo close to getting back on the road, it's just this pesky bb that is delaying me. Good luck!