Thanks Mark, it is a an F135. Going to give you a call tomorrow for some other stuff and hopefully you have a couple of those bolts too. I really appreciate you following my thread and all your help!
Thank you Mark, I found the thimble, need to spring clean the garage.
New challenge, the bolts spreadsheet and the bolts I got from Specter call for 10M x 1.25 for the thermostat housing to block. The bolts didn’t fit. A 9M x 1.25 was tight...
No pic to offer at the moment. But I can tell you it’s a small aluminum cap, like a thimble, with I light duty spring which fits inside it and helps keep the two halves pushed out against the rocker shafts.
Hth