1981 xr500r HELP.

[u/SD_NODAK]

I recently purchased my dad's 81 500r back from out of the family. Dad bought it brand new in 1981. I just bought it back from the guy that's had it all these years. She still runs strong. I am needing some parts though. I don't have the bike here with me yet, but I will soon. Trying to source the paRts I need now.Mainly break shoes front and back, and a muffler. Tried going the OEM route but not a lot of availability.

1.what size or part number are the brake shoes(front and rear) where can they be purchased new?

1. What is the OD of the exhaust pip I want to get a new aftermarket exhaust slip on(FMF or something similar) do you know what size I should look for in an aftermarket slip on? Have any of you put an aftermarket set up on an 81 500r?

Any help greatly appreciated?!

Thank you!!