Do keep them and clean them up. The AR-series were mid-level Suntour - which means they work very well indeed. And your 1982 time-frame is spot on. I had AR's on my old Motobecane Grand Touring - may it rest in peace (a ditz ran me over). And I bought one new for my funky old mountain-bike. They worked great! And I still have the one from my mtn-bike. As well as a near-mint condition Shimano Biopace triple crankset....