T-lock shoes

Looks like to me you need the 15-195. The 15-195B has a metal cam that is 'open', meaning it has no back wall so you can see through it to the other side. Yours is closed. The 15-229 has a 'black puck' in the back that makes it slightly thicker. This appears to be the standard 15-195 to me. 

There is a problem, however. Your old shoes have a characteristic groove in the stem, meant to interface with a similar indentation in the body of the channel balance it connects to. Both our shoes and balances lack this groove. This means you'd need an all new channel balance I'm afraid. Fortunately, we know this is a Series 795, and this balances comes with the 15-195 attached by default. Let me know if you have further questions. 

You know, that thought occurred to me in the first pictures of your channel, but I immediately focused on the configuration of your old T-Lock Shoe, which does have that groove. But your metal channels do not, so you're right--I think it's possible the 15-195 will work just fine here. It should fit snugly in the channel and around that rivet.