found a supplier called then and now auto in Ma. that has types of rebuilding parts and services , yes that is is the pump # im guessing you where looking at it on ebay
I have one. It is the correct pump for a Cobra. The 3723S is often advertised as a Cobra pump but that’s not correct. When I rebuilt mine, I found that the later rebuild kit will work but you have to punch out a hole in one gasket that’s not there on a later model.
Sounds like you found a kit though, so you’re set.
Larry