Thanks jyasaki. Sal's actually has a web site but it is quite generic and no listing of accessories. I googled "bow anchor roller" but cannot find anything worthwhile (stateside). The RIB scene in the U.S. is quite sad, I guess it is just not much of an industry here.
Up here in the Pacific Northwest, 99 out of 100 boats here is a hard bottom boat
And there are only like 3 dealers who handle RIBs. Are there more RIBs in the bay area? I come down to SF for business occasionally if there are more RIB vendors I will stay an extra day next time just to shop.
By the way, Nick Hearne from the UK pointed me to an UK dealer who has a nice one (see picture), but it is all the way across the water....