MPC 2500 drum/dev unit question

[fshead]

there is a plastic pin on the back of the pcdu mpc2008 and the front cover different that prevent the correct insertion, and then the TD connector, surely it has the wires set differently.I would do this:disassemble both pcdu, and take the good parts of the 2800 clean them well, and insert them in the frame of the 2500

thanks
NOW i gotta make time to pull a wrapped drum unit and test on my mpc3300 to confirm CQ is solid and parts are
still good.
I have bought any drums,drum blades or charge rollers for any of these as i had bought a large lot
of new drum units from some tech and parted out ant trade ins or cheap lease returns wth low meters