As mentioned, Rare parts for Idler or Kanter Auto Parts in NJ or search Ebay,there's always several NOS Idler arms or kits on there.
https://www.kanter.com/
I used Lares to rebuild my control valve 10 years ago, still works great!
https://www.larescorp.com/
Fatsco Transmissons in NJ has your pan gasket, maybe screen as well. 62 uses a screen not a filter, not sure what they used in 63. should be able to clean out the screen/filter
https://www.fatsco.net/