Where is a good place to get Walbro carburetor parts on line? I may need help making sure I am getting the right kit.

I have a SDC Carb. off a Brison 70 cc engine (no. 38-E I think, it has a 62-36 stamped on the choke plate) and am looking for a rebuild kit, also how do I know if the kit has the newer diaphram material that will stand up to reformulated gas?

Many Thanks,

WRK