RSH,
Congrats on your find!
I am a big fan of those as well and mine carries the same specs as yours. You can easily still get a comparable rest/plate, but I am not sure of the availability of the original calf hair plate, although I am pretty sure it would be easy to make.
Please post some pics of your bow, those bows are always great to look at.
Maybe it's time we start a serial number thread on here for Bear A Risers just to see how many of those originals are still out there and in what configurations.
Good luck with that new bow.
Bernie