Hey Jeff, I know the Baxley product very well. Made in the USA, strong, robust, sturdy, heavy duty. I looked at the Black Widow and it didn't appear as substantial as the Baxley. Believe one of the three reviews on Amazon mentioned that as well. If you owned a lighter weight Japanese bike I might suggest to save the $100 and run with the Black Widow. The K1200GT is a big bike and I'd hate to have you come out to the garage only to see it on its side.
No disrespect to those that have the Harbor Freight chock but I'll bet every motorcycle I own it's made in China. Everything I purchase at HF seems to break or go belly up after a short time. Not a fan of HF even with the money saving coupons.
Ok, you're really not
going to like my suggestion. I say forget the front wheel chock and go with a rear
wheel stand from Pit Bull. This will work slick as snot and the quality made Pit Bull stand will hold your K1200 in place even during an earthquake. Well, maybe not an earthquake but you get what I mean.
I use this stand all the time on my Ducatis and before I bought a K1600GT, this worked fabulously on my K1200GT for removing the rear tire, performing a final drive service, changing rear brake pads, etc... In other words it does much more than just keep your bike upright in your space constrained garage. Also, with the stand engaged you can push your bike around to get it perfectly placed. I know it costs a little more but in the end it's worth it.
Good luck buddy!