Check this page http://www.vintagekramer.com/sambora.htm
There are all Kramer guitars he owned from 86-90. Unfortunately he sold them all and aren't produced anymore.
But one model is in stores again: http://www.musicyo.com/product_specs.asp?pf_id=896
That's the one Richie uses in the Livin on a prayer video. Great masterpiece...