To be clear ... Dossa donated the cars while Sly donated the on-set experience and the vodka -- they just packaged all of the items together to sweeten the pot. Stallone couldn't make it to the event ...

Martin Kove is thrilled his old pal Sly Stallone has become a Hollywood ambassador ... TMZ caught up with the "Karate Kid" and "Cobra Kai" icon at LAX ... and he straight-up told us Sly is ready ...