I'd not buy an old bass back, but I do keep an eye out for a Fender Precision I (stupidly) sold in about 1989 - black and maple.
I'm curious as to what happened to it really, so if anyone has such an instrument with a national insurance number scratched onto the back of the scratchplate...it may well have been mine.
It's water under the bridge now (and I don't get on with P-necks), but I still wonder....