The SCOF technical library has a tech article with instructions and photos for adding a bolt to the left leg of the roll bar.
This particular article is one of the complimentary "guest" articles available to all owners, and gives a taste of just a few of the resources available to Superformance owners through SCOF.
Here is a link to the tech article index. The roll bar mod is one of the "Guest Tech Articles" listed in the upper left hand of the index.
Complimentary S.C.O.F. Guest Technical Library Preview
Hope this helps!
Jim Kellogg