The 3362 and 3386 trimmers both have the "P" foot print which matches that of Bally foot print in image one of post #1. The only difference between the 3362 and 3386 trimmers is the body and element size. 3386 has larger element (and body) which allows easier adjustment to a finer granularity.
The 3352P will also have the "P" foot print.

I checked Vishay, Bourns, TE, Piher and CTS and nobody has anything close to the dimensions you want. You might be stuck with something similar to the "P" foot print dimensions.

Good catch.
Yeah, I looked at that Piher series but I only looked at the horizontal mount parts.
Vertical part with "B" spacing looks about right. About 8.8mm between two resistive element connections and 4mm from resistive element to the wiper connection. That's nearly dead on with his stern measurements above.