Promised an update, here goes: called Torklift, within 30 seconds they were taking down the address of the shop to overnight the bits to. All hail Torklift.
Hopefully that does it. I’ll chalk up the rest of the expense and aggravation to experience. If I had to do it again I would have tried to find a spring shop to do the work. I also would have ordered directly from Torklift instead of having the dealer do it, checking beforehand to see if my overloads had the pre-drilled holes. Let the youth of tomorrow profit from my errors!