The original design for this clip is to drill a hole in the remainder of the original clip and bolt this on. In my case the break was too low due to a previous fix with a spring to hold it down.

This design is intended to be glued on. I used DAP RapidFuse 7079800171 and will report back later how it holds up to the flex from track use.

I'd recommend ABS or ASA.  Your mileage may vary.

Update 3/10/24: Survived 2 days at VIR so I'm calling it a win!