Greetings ya'll, just a couple of quick questions,

1, What is an acceptable wear rate on a 12a housing??
My old engine dropped a seal so I figured I'd rebuild it for a spare...
The rear rotor housing has a very slight scratch in it, the front is fine.

2, Did 12a's come out with 2 peice 3mm apex seals????
I've been told no but this is the first time in 25 years this engine has been pulled apart, its only done 85k kms in 25 years. Thats the reason I want to keep it..

Thanks for the help.