Rivco rollers and handle

Hello,
I need to replace the rollers and handle on a metal framed sliding glass door that I believe is from Rivco. The photos show the roller assembly removed from the door and the roller on the other side that is still in the frame. The only markings on the roller assembly are the 68 over the 30 and the name Allen Stevens Corp., Woodside NJ.
The last photo shows the handle area. The mounting holes are 4" on center.

Please let me know if you have replacements for these parts.

Also, I would like to paint this door frame. Can tell me if the frame should disassemble easily if the screws are removed?

You have already removed one bottom rail. The rest should not be much different. Just keep track of what goes where and which side faces out.
I have seen some paint done well and some very bad.
Talk to some people who know paint and let them know you are painting old, mill finish, anodized aluminum. They should be able to help. Keep paint away from any pile or rubber weather-stripping and the vinyl glazing material.