I have one of these in the original box for sale. This will upgrade a Qudra 650 or Centris 650 to a 68040 clocked at 50MHz.
One difference between the PLUS version and the non-PLUS version is that this one has the L2 cache.
Includes accelerator, original box, manual, anti-static wrist strap, CPU removal tool, and floppy disk.
There is a guy selling these on eBay for $60 right now. My price: $40 plus $7 shipping. I do ship internationally, please ask for a quote.