Fry, I am also using the Audix 1290 mics. Before I sold the Audix SMT-MICRO mounts to Cliff, I played around with them for awhile. You can use the Audix mounts on a Shure vert bar and get ORTF, DIN, and XY, but not NOS. The mic bodies are about 3.5" and the shockmounts add about an inch more separation from the bar.
If all you are looking for is a good holder, I can recommend the SMT-MICRO. I can't really recommend them for shock protection, so you might as well use the mic clips that come with the mics.
Ragan