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1979 to 1981 used the "cafe racer" frame so those years have a special seat and a few other parts. 1979 in particular has a few unique parts. Do a Google search on XLFAMES [XL Fits All Models Except Seventy Nine] for more info.
There are special needs for all model ranges. I have never spoken with a 1979 owner who was unhappy with their choice.
There are groups of owners who find the 60s XLs to be the best. My favorute is 1978. Lots of different opinions. No one will agree.
Whatever year you buy, try to get a machine that's as close to stock as possible because a mish-mosh of parts on a bike is a bitch to troubleshoot and tune. I ended up buying the FM for 69 and 79 because of the mix of parts that mine came with.
I restored a '74 ironhead about 15 years ago - the results of a fire. It took me a while to get it back together, but finding parts didn't seem to difficult (of course, that was 15 years ago). Harley seemed be to pretty good at mixing and matching parts, using previous years parts inventory for preceding model years for XL's and Big twins. until they got smart and started JIT (just in time) management. On the flip side, however, that led to a certain amount of parts obsolescence that we all see and suffer from more and more.
On a final note, remember that motorcycles rear brakes were standardized internationally in the mid-70's. For XL's, that makes for a very interesting mixing and matching because the frames didn't change in that respect until I think 77. Between the begining of the standardization and 77, HD just made a Mongolian cluster of the rear brake linkage (no offense intended to any of you Mongols out there). Right: they used up all the old frames made in previous years.
Good luck in your search: if you find a good one, there'll be a lot of maintenance, but it'll run like a bat out of hell.
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