Good used rear frame from a (R13) 2002 F650 GS. It has scratches and light rust in places and a nice paint job in paint code 121 would bring it up nice. The frame is straight.
Check your model on the REAL OEM site to make sure it will fit.
Shipping will be high so ask for a quote before purchasing or you can arrange a pickup at the checkout.
It looks like it will fit the models listed below.