Want to Buy Searching for Certo Super Sport Dolly film holders

Hi- just got my hands on a decent Super Sport Dolly rangefinder,
Now I'm trying to find the 6x4.5 sheet film holders that can be used with it.
Would love to try and find the back viewfinder attachment and 6x4.5 film mask as well!
(Not asking too much, ehhh?) any leads would be appreciated!

Bob K

Have items for trade too.

Forgot to mention I have a number of 6x9 and 9x12 folders that might be worked as trade.

I found 3, so I know they exist. Anyone? Expanding search to any 6x4.5 plate holder?