well, national cycle emailed me back today. They never told me when asked back in November before I bought the vtx1800 windshield but the rear brackets on back of windshield made for the valkyrie are 2 inches longer than on the vtx1800. That would have been nice to know BEFORE I bought it used right thus the reason why I called BEFORE buying it.
They will let me know if they can ship out, for free I hope or just cost of shipping, the 2 chrome mounting plates on back of windshield made for a valkyrie vs. what is on there now the vtx1800.
I tried for like 3 hours messing around wondering why NOT fitting putting scratches in one of my chrome fork mount covers and few scratches on my chrome headlight since the windshield was rubbing on the top of headlight before I saw it needed a cloth on top.

2 inch longer brackets would work I think giving me tops 1 inch clearance around headlight, if that.