I'm pleased to be of assistance to a fellow Model 11 owner. I like to help if I can, because other members of this forum have helped me a lot in the past.
I don't know if you scrolled all the way past the Model 11 information down to the bottom of the Bob's Gun Parts site, but if you didn't, you should. The last thing on that site is a photo of all the different types of Remington firing pins he has, for several different models of guns, and the photo shows both of the two different designs of firing pins that have been used through the years on Model 11's. Since you've already disassembled your gun, you should be able to just look at the pictures of the two different Model 11 firing pins pictured in the photo and compare them against the one you actually have to know which type to get for your gun, if you ever need one.