I think the holes will be wrong. On a 90/110 - and the item in the pic - the holes on the outside are closer together as the cross member tapers. If you have a military series cross member it'll not taper, holes in a rectangle ? ....you could drill it but it'll look weird.
Better to fabricate a holder. If I remember correctly its only a bit of metal with a key-hole cut for the antenna base, the actual mounting strength comes from the clamp at roof height ?