Wow that Calvary Custom looks (to me) like a near knock-off of the Mapam backrest, except the Mapam doesn't have the two round holes in the luggage rack its square shapes, and the Mapam backrest pad's backplate is the same design as the Mapam luggage rack instead of a solid plate. Wild.
Anyway, I don't know if it'll fit your '05 did the ebay ad specify?