The PB has different body underpinnings to the PA but still rusts – especially outriggers, sills and bulkhead.
Engines are capable of vast mileages but watch out for cylinder block cracks in exceptional cases. Transmissions last well.
Specialists in aged Vauxhalls are thin on the ground but the Vauxhall Cresta Club performs wonders in coming up with rare items. Panels and chrome for PBs are in extremely short supply, though.