M&W MM U or UB Pistons

Seacpink

New User
I was wondering if someone here might be able to give me a little information on some pistons I found in my grandads barn. He used to have a Massey Ferguson dealership way back when and I found a box of MM piston set made by M&W. It is the add more power set and has the model AP-122 on the box. Anyone happen to know what size these pistons are? I hate to open it because it has the original staples in it. Thanks in advance for the help.[/img]
 
I have an old M&W brochure & it shows kit #AP-122 to be 4&3/8 bore with 5 ring pistns for U & UB tractors, & the rering kit # is RS622.
 

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