I would contact BT Technologies. I have the exact setup you
describe. TOA150 on a AP900GTO. They sell a Universal Saddle plate
for the AP900 and a dovetail plate to mount the TAK 150 clam-shell
rings on. Just slide A to B and you're up and running. I can give
you the part numbers but Brian is great.


Rick Kuntz MS, CCT
CEO
CETECH, INC
850-763-8383
cardiofuse@mac.com