Will the MAC cage fit the Indy? I really fancy a full cage but the MK restricts my knees as i have very long lengs - looking for bolt on to the outside jobbie. Right now I have a std roll hoop with a horizontal bar half way up. no back stays

Give the factory a call, they build cages to the customers spec.

You may have difficulty in securing the front uprights. Extra strengtheners will probably be required.