I've got extra cables, belts, and a spindle.
So far, the only thing BOP did not have was the clutch, the BOP website clearly pointed me where to find the replacement directly from NORAM.
The replacement spindle has no manufacturer marking or numbers, so I'm a little concerned about finding one of those in the aftermarket. Worst case, replace all three from another manufacturer to get the correct pulley alignment and you are good to go. all I'm pretty confident, that the cables are the only thing that may not be industry standard and will require fabrication should you need one in the future. If I live long enough to need a deck or front caster, I figure the used price will be so low that buying someone's dead BOP will add a couple years to the life of my fleet.