I can't be the only person with this same problem, but I have found nothing that fits right on my 1967 with the single 11" booster. I wanted to get a new valve and the only thing i see is the Dorman 80189 which has a grommet fit inside of another grommet with no lip to keep everything together. This just looks like a leak waiting to happen. The other that shows up is a Raybestos 89000 which just looks small. The booster has a 1-1/16" hole and the old check valve is a lot bigger than all of these aftermarket ones. I found a few reproductions for a Mopar or Ford but it has two inputs. Was this year just an odd size hole on the booster?
The in-lines I saw where on cards on display at the front counter of my local Chinese parts store. I go in there to get lubricants and small parts such as fasteners to replace things I though I had in inventory, but it either fell out of it's blister pack or other wise was misplaced (I hate squirrels, they are rats with furry tails and get into everything).