Other McMaster Carr O rings

I have a new style protec head and was wondering what size O rings it took from Mcmaster Carr. I got the recommended -43 part number ones from the tec FAQ but they seem too narrow. I'll post a picture after work.
 

#ZERO

Beach Bum
Location
Florida - U.S.A.
It depends on the production date of your head.

Protec Cast Rec Head O-rings:
Style 1*, viton, -043, pack of 10, viton: 5267T57
Style 2*, viton, -153, pack of 2, viton: 9464K114
 
According to the pictures it is the style 1. They are the correct size to fit the groove perfect, just narrow. Two in the groove would work, Lol.
 
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