I'm looking at a 70 frame that I'm going to be going rigid with. I like the cleaner look of the internal springs on the 71 and later forks as well as the duct on the front wheel hub. I can't imagine its a straight swap, that would be to easy. Is there a kit of some type to put the newer triple tree on the older frame or is it possible to put the newer forks in the 70 triple trees. I'm putting the bike together as I can afford it but I'd like to know what kind of parts I'll need in the future.