Wow. Such a specific collection of items which could only be of use to a small number of people, all of whom are forum members. Not only that but these pieces would only fit on a few specific instruments - like the 8-string bridge... For the seller in this case, I'm sorry but "rare" doesn't translate into "worth a fortune". If anybody here has any interest I'd suggest offering around $250.
Ironic because if this really is part of Entwistle's spares then there must be a legal reason why they can't mention that. Some diehard Who fan would likely pay what they're asking for a piece of the band's gear.
Jimmy J