MPP Roll Film Backs . 120 220 ?

I am thinking about buying an MPP roll film back for an MPP Mk vii
There doesn't seem to be much information on the internet about this simple accessory. I might be looking in the wrong places.

I am wondering if there are different models for 120 and 220.
Or even a moving film pressure plate to accommodate the difference thickness when a 220 film is used.
Important for me to know before possibly spending cash on a wrong model.

Also, as the MPP film backs seem so thin on the ground at the moment, can anyone recommend any other makes that would be compatible ?

Thank you.

Short answer, there are two. Nominal 6x6 and 6x9, otherwise the same.

The MPP Mk. VII has an International Back. In US parlance, Graflok. There are many makes and models of roll holders that fit 4x5 Graflok/International backs.