Nick, not the info you seek, but I will share my story. Sent my booster and mc for my 72 to Cardone in Texas thru Rockautos rebuild service. Came back in ten days with nothing done, no explanation . Cost me 42 bucks to ship. Then ordered one outright from Rockauto, received one with no center rod and those gasket/seal hanging on it with a ty wire. Return instruction said to ensure that rod is sent in with the core, but someone did not. Notified Rock of missing parts, they said send it back and they would send a replacement. I did . Week or so later Rock notified me on NO replacement , heres my money back. Could not find one ANYWHERE. Finally sent mine to Booster Dewey, got it back yesterday. Started in March, just now got one. Seems the rebuild guys are the only ones producing any useable builds, so , prepare to wait a bit on most any rebuilders...