It seems to me I remember reading that guys putting them on interstates needed to shim up the front of tank like a quarter inch or something. But I think they still had to notch the front two around the pods.
There were two outfits making the ones most guys used, but I can't remember their names. (one might have been HDL back when they produced a few special parts for Valks)
I had them on my 99 Tourer. They are smaller than these and secured better. I mounted these with silicone. I have a spacer under my tank, but plan on adding a taller one.
David