Tillotson sells diaphragm and gasket kits and general repair kits designed specifically for Tillotson carburetors. Tillotson Xchange sells carburetor kits for non-Tillotson brands, such as Briggs & Stratton, Mercury and Mikuni.
The Tillotson website lists DG kits and RK kits. The DG kit contains only the diaphragm and gaskets; the RK kit includes diaphragms, gaskets, inlet needle and seat.
Some kits are available online while others are only available in stores. The site has live links for items that can be purchased from online dealers, and some kits can be ordered over the phone. A contact page lists phone numbers, email addresses and physical addresses for worldwide offices that can identify the closest dealer for items that are not available online.