A buddy of mine gave me some nice mags off an 80's evo bagger. I want to put them on a 79 lowrider I just picked up, is there any fittament issues I should know about before I start tearing stuff apart?
If you're still running your narrowglide forks, the front wheel will not fit between them. The rear should work on the '79's axle, so center the wheel, space the sprocket so the chain lines up, get the caliper lined up on the rotor, and make or find spacers to make it all work.
If you need a more detailed answer, please be a little more specific with your question. What exactly did the wheels come off of? which brake are you gonna run? is the Low Rider pretty much stock? Maybe a different fork? Pictures are always helpful.