Was able to source some NLA / current springs for the Wisconsin engines,
I also have many more parts not listed these for these engines so if you need something let me know.
Prices listed below at the "GTT special price"
PM61A (TR10D,TRA10D ect)
PM166 (NLA , available while quantities last)
TR/TRA 10D Engines for 2900 RPM or less loads.
PM142 (TR10D engines with serial number 3909152 & lower)