Thanks, guys. Problem figured-out. And to the above, the bushings lifted out AFTER putting the old bridge back on with the original bolts.
After much tinkering around, I figured out the SAE bolts from the Hipshot DO fit, however, there was paint dust or some type of black inside the threads on the bass. Weird. Long-story short, I removed the bushings from the body, tamped them back in with wood-glue, and every thing was good-to-go. It was only after removing them from the body, I discovered the SAE bolts from the Hipshot DID fit, but there was just enough crud inside to muck-up the threads. After some cleaning and WD-40, I was able to install the Hipshot bridge.
Everything is good, set-up, and plays wonderfully!
I can't say I'm super-impressed with Gibson's QC, but then-again, the bass sounds amazing...but I can't help but think a Gibson USA-made instrument should have a slightly-better build quality and control over which instruments pass their standards. Honestly, I've seen better build quality out of Chinese instruments. Not bashing on Gibson, because they do sound great. I plan to keep the bass, and I'm happy with my set-up, but I don't know if just anyone would be willing to take all of the steps I've taken to get the most out of a stock instrument.