Why would you want to make up a spare pump module and carry it around with you, waiting for the original to die at the most inconvenient time and place and then try and replace it there, rather than in a well equipped garage? I would say the better option is to replace the original pump using the kit from Glencoe Ltd., then you have no worries about the pump failing.
Not heard anything about the Krazy Horse compensator for a long time but Phil Bleazeys upgrades work well and are pretty much proven now. There have been a few Lambda sensor failures but not a big problem, some replaced using the Bosch item. They probably don't like the vibrations from the engine much. Have you got your M3W yet? Production looks like finishing soon.
