when you say the very last piece, do you mean the end cap that goes on the second half of the case where the fork's shaft comes through? If that's what you missing, i wouldn't buy a new gearbox just for that. I have a 2nd buggy to build that is also missing one and intend to fix it by drilling and tapping some square aluminum stock. Can't see spending $100+ just to fix that issue.
How bad was the carb that you've already bought a new one? was the aluminum pitted internally?
If you could live without reverse, look up "Howhit" on e-bay, a company called BMI Karts has the leftover inventory of Yerf Dog including a lot of parts from recalled buggies. They sell complete and partial engines for pretty cheap. Those particular ones don't have an output shaft long enough for reverse. You could get one of those running and in the buggy, then add reverse when the money becomes available later by swapping the shaft.
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