I recently purchased an Advanced Series - Kit with the intention of using the cables I already had from a Leviton EVB32-8ML, but the cables are substantially thicker.
I already have a NEMA 6-50P plug installed in my garage, but your listed input cable only has NEMA 14-50 and NEMA 14-XX as plug options. Do you have an input cable that will work with a NEMA 6-50P plug?
We do not have a NEMA 6-50P option. You may be able to reuse your cable with a larger gland. The largest Option here would probably be perfect. https://www.polycase.com/cg1
The hole in the enclosure will need to be enlarged, we would recommend a step drill.