What kind of parts do you need? My local hardware store carries rollers, hinges, and such. Menards carries parts as well.
He hasn't been on in some time, but I've had work done on a few occasions a few years back my INGO'er Marcweid ( @ mention not working not sure if that's because he hasn't been on since the forum migration) https://www.indianagunowners.com/members/marcweid.22894/#about
He owns (assuming still does) 1st Choice Doors.
ABOUT US | 1st Choice Doors
1st Choice Doors is a top notch garage door company based in Indianapolis. We provide expert garge door repair and installs.www.1stchoicedoors.com
Know you mentioned parts, but if you need work, etc or he may be able to get you something.