I just installed 2 rectangle caps from Digikey that are 15000v/millisec. I had made a plate for my 9.9/15 to hold them next to the coils.
I am happy with the results..so far. .
….might have been 1600vdc…yea.,just checked..but still..15000…
https://www.digikey.com/en/products/detail/kemet/R75TR32204040J/9842171
..heres what I used.
