21. 1200 / 1250 ENGINE LOCATION & MOUNTS:
Left and right-side engine mounts must remain
within the Stock dimensions, steel thickness (no
aluminum mounts), location and configurations. The
right-side motor mount may be replaced with the
optional motor mount (if the optional right-side
mount is used; you may remove the Stock right side
mounting tabs). Rubber mounts will be permitted if
the engine remains in the Stock location. The engine
mounts must be bolted on to the frame as specified
by USLCI. Mounts may not be welded directly to the
frame.
If you check the rule book, you will see the mounting dimensions and specs.
https://www.inexseries.com/documents/2020-inex-rulebook-12-16-2019-final.pdf Page 57. I don't recall ever seeing anyone not use the right side mount. Hmm...