Have you tried contacting PTC about the issue?
You could try some longer grade 8 bolts, but you may have to shave the heads for clearance... but don't go too long or you could puncture the torque convertor.
not really too keen on them right now.. they are very slow to help. They foobar’d my first converter with the rong engagement for the input shaft, rebuilt the already new converter with the correct parts, then after looking at the pads on the converter they were not new to begin with, turns out they reused that part of the housing from an old trans..
