I seem to remember many years ago in BP magazine they had a short article on Steve Harris. It made reference to his main bass as a slab body Pbass that had been refinned many times (the white one in Georges post). It showed others that were similar Pbasses, all with the Basslines Quarter Pounder's and B.A.II bridges so that they would sound similar. Of course this is going from memory, so I could be off somewhere.