on the coin mech frame, you need the armature plate, retaining plate, screws and spring. I have all those for ya.
your payout counter has the extra cam and microswitch for a hopper cutoff relay circuit. How many relays do you have with capacitors and diodes on them?
you have the switches needed on the payout counter step-up arm to support a win meter. It's the same switch as would be used for a total out meter and the win meter step-up coil would be wired in parallel to the total out meter step-up coil.
in this case, I'd guess the white/yellow 53-2 wire on the step-up arm switch would attach to a win meter. That wire should be on the hopper plug if your cabinet is a 883, but you'd need to bring it to the door. There's probably available pin locations in the door molex/amphenol plugs to use for adding a wire if you have the crimp pins.
you already have wire 70 on the door, so you'd need 53-2 and a reset wire ... bally typically used 78-1 from reel mech B-1 switch which will be available on the reel mech plugs.
that just leaves whether a win meter would fit and sourcing the parts. If ya look in
https://bingo.cdyn.com/slots/1089/pics/ at the inside door pic, you can see how the meter is kinda long and you need a cutout in the lamp bracket. I'll dig into a parts box and see if I have anything.
the 5000 manual shows the meter and its mounting bracket on page 6.