yes that is what I used on mine plus I bought the complete mount off ebay knowing I would have to machine on the lowers a little as they swell at the bottom like yours does. the one thing the bothers me is the height off the bar on them top mounts haven't thought much until now but a tall post with two 6mm bolts (in some cases 4) as weakness goes doesn't seem to go along with his concerns about the under bar mounted GPR model bolts times 8 ea..
Also in my searching so far and I plan on more I do not remember seeing a lot of over the top mounts. but if I can figure out a supplemental gauge mount The base top clamp on the standards are quite beefy. let me get to work and ponder more