My dad has a 87' softail custom sitting in our back shed with rotten tires.... so for his birthday i want to suprise him with a set of new tires for his bike....i think the number on the front was k 181 and the number on the back was mh 90 21 56h....any idea where i can find these tires....thnx much harley kid

 

Your local Harley dealer should be able to help you out with that. But it sounds like it has been sitting for a while. If that is the case, it may need a lot more than tires to get it on the road.
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Stock tires on that era Softail is 80/90/21 (MH21) on the front and 130/90/16 (MT90) for the rear.
Any Harley dealer will have these tires (Dunlop D402) in stock. And most mailorder motorcycle shops like Dennis Kirk, J&P Cycles, Chaparrel, etc...Can't go wrong with Dunlop, Metzeler and Avons.

MikeyB