well, I posted this same question in my build thread... since it is a more general tech question, I thought I'd give it s shot overhere too.

Can anyone help me identify these retainers? I wasn't the one to have the head built, and I don't have all of the details... just wondering if someone would know by looking. Most retainers I've seen are flat and these are a little different.

TIA

 

no one?

it's cool, just thought I'd ask