Stewart from D&D claims that if there is any indication of movement from the pump the block is good & some kind of repair is needed, no reason to toss the unit.
Phil has everything for both style pumps, new & old, except possibly impellers, he was unsure of it.
I have gotten by with teflon tape around a rubber bushing to make it seat better in the hole & it is still running.
Glad to help, I need them too.