This was actually super helpful, thanks for taking the time to post it! I got some partial part numbers from your pdf, searched mouser and ended up in the online mouser catalog, which is much better for this type of search. From there I think I found an equivalent part in their catalog, part number PT10MH01-502A2020-PM in the "d" category, lets see if I can link the exact page:In case you cant find them. May be they can be substituted with PIHER trim pots..
by Dale Wilson
by Jake Hertz
by Jake Hertz
by Jake Hertz