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.