These are the original inner skeleton supports for a Yamaha DX7 plastic side panels. I replaced mine with wooden side panels because the corners had some chunks missing and were duct taped to fill the gaps when I bought the synth. The plastic side panels were no good but these parts from inside still look okay. They have a couple screws in them and tabs. I have no need for them.

They have some wear, a couple oxidation spots, and they’re not 100% perfectly straight. They are in fair condition. If yours are missing or in bad shape, these could be a good replacement.

Thanks for looking.

Accepting just about any offers.