I'm trying to order chain and sprocket kits from Rocky Mountain MC. My brother's '89 has stock 14-50 gearing, and my '93 is 14-50. I'd like to run 15-50, so I can be a little taller in the Dez but gear down for the occasional trail ride. The cheapest way to do this is to buy a 14-50 sprocket kit, and then buy a 15t front. Their website won't let me mix and match. So my question is this: do the rear sprockets (48 and 50) have the same bolt pattern for both years? Can I buy a "stock" 89 for my 93? Thanks!