So you are rebuilding your 29mm Smoothbore carbs, you are going to need this kit!  It includes all the o-rings you will need and they are made from Viton.  Viton is much more durable o-ring than stock.  Also included are 4 jet block gaskets which seem to be very hard to find.  Please check my other auctions for more 29mm carb stuff!  This order will be shipped with a tracking number.