So I thought I did my research and ordered about 250.00 worth of rotopax gear. However, upon receiving the stuff, it could not be mounted to the rear ladder of my Slee bumper. The holes on the ladder for mounting items are 3.5” center to center. The rotopax holes are about 2” a part....and I really don’t want to drill into the Slee ladder. I have looked at a few of the various rotopax mounts, but none of the them say how far apart their mounting holes are and I ha e no local sellers. Does anyone know, with a large amount of certainty, what mount is needed to mount the rotopax to the Slee rear bumper?? As always, thanks in advance.