You can simply bolt 11.75" slider caliper brackets and calipers to your existing disc knuckles.

New black zinc plated 11.75" caliper brackets with hardware $90 pair

New, black powder-coated slider calipers with hardware and pads $120 pair

I don't believe pin type calipers offer any advantage over the slider type. In fact, most pin calipers result in fitment problems when performing disc brake conversions.