Assuming these are for the 13brew I'd take a set, maybe 2.

Tom

I am using a gen II engine to get the o-ring groove dimensions.

Anybody.
If you have the engine apart please measure the distance from the 
inside wall to inside wall of each o-ring grove the long way for me. 
A steel tape measure will work fine. Also measure the groove depth 
and width using at least a dial caliper.


Paul Lamar
 
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