Yes your 13.25” inserts are made for a Gil body that size and that is the only correct body they were used in. There are 13.5” Gil bodies too but they are two different sizes bodies, the rings aren’t really made to adjust the different size inserts to the same body. There are 13.5” Gill lenses also. If you can’t find ( or don’t care to pay the $1000+price they’re bringing nowadays) a Gil frame you can mount your lenses in a common plastic capco body but the body will have to be modified to hold it as all capcos are for 13.5” inserts. You grind/sand off material at the top and bottom faces of the body where they screw together to make the circumference smaller to hold the lens. It’s not easy but you can do it with patience. The inserts will never fit the body perfectly but they will hold well enough for display purposes. Good luck.
