I've been on the learning quest since I picked up a Winfield manifold a couple months ago. I haven't heard of an SSR - only the S and SR (in addition to his earlier carbs) which is the S with a different bowl with an accelerator pump. Winfield really tailored his carbs. They came in A AA B BB etc with each step being a larger venturi. They are very adjustable - even the accelerator pump. There are a couple gurus - one rebuilding and the other making new parts. There are some videos on YouTube. If you have a Winfield manifold check the bottom. It will have a casting number and stamped letters calling out which carb it fits. I was able to get a nice complete SR-BB to match my intake. Scour the internet you'll find a lot of info. You'll want to make sure you are using the correct parts and not mixing A with AA or B etc. There are a couple sources for gaskets. The guy here in the states (but he doesn't have the accelerator pump diaphragm - yet) and a guy in Germany with the diaphragm on FleaBay.
