My new car has the same set up on it but it is in the enclosed car trailer and I broke my left leg last week so I can't get out and about well enough right now to go look to see if it has a part # on it for you, sorry
I'm almost positive it is a Powermaster. The thickness of the plate will be a factor in which shims you need to use with the starter, mine had a really thick adapter shim in plce from the prevouis owner who had a aluminum KB block in it, I had to change it to work with my 400 iron stock block stroker motor
Mine is for a Mopar JW adapter flex plate with the crank adapter and the Mopar ring gear size, I think