UPDATE>>>
I bought the Robart 631 85degree air up and down retracts with a standard deluxe air kit and it went right in.. The problem i'm having is that the 1/2 inch RoboStruts are an inch short... I have a set of ESM oleo struts from an ill fated BF110 that fit but I hate the axle setup. The axle just screws into the end of the strut...
The smaller Robart airtank fit snug like a bug in a rug behind the exhaust in a little compartment on the front bottom of the fuse... I'll have flightline updates following this weekends test!