Rumor has it that a Mean Well Model 65A (+5v, +12v, -5v) and a Mean Well Model 65B (+5v, +12v, -12v) can be used to supply the +5v and +12v needed for a Model III motherboard, video, and ONE disk drive.
(Thanks to Jay Newirth for figuring this out!)
If you are willing to not have a TRS-80 keyboard and would accept something more modern, the folks over at Plaidvest Software have noted that you can install a Wireless USB Jelly Comb KS037 into a Model III (once you take out the existing keyboard) with a NEWKEY/80. They also have a Thingverse to manufacture a keyboard support if you glue a washer to the underside of the keyboard.
If you need a replacement badges for your Model III, NewSoft sells them for a very reasonable price.
If you want to replace your CRT with a green CRT, reach out to:
Lexell Imaging Systems, Inc
510 Henry Clay Blvd
Lexington, KY 40505
Contact Gina Studdard
Green CRT PN is VDC1208DP31BE
(Thanks to Jay Newirth for finding this!)
Power Connector Assembly
If you would like to use a standard computer plug instead of the one permanently fastened to your Model III, Newsoft sells a repalcement power connectory assembly. Note: Will require you to open your Model III and do some disassembly and re-wiring.
If you would like to repaint your Model III, you might want to read the How to Paint your Model III or 4 guide by Patrick Bureau, downloadable Here.
For hard drive and floppy drive replacements, visit: