Here's a picture of the previous generation (III?) Everett Morrison frame showing the welded pads for the roll bar mountings. Two bars are attached (not installed yet):
The attachments are above and in front of the gas tank. They consist of rectangular, horizontal pads with attachment holes drilled in them.
The frame has been changed, but an equivalent is made by Power Performance.
Note: the roll bars are stainless and stout. Possibly 3/32" wall tubing?. Unfortunately they were tested. They worked!
Tom