This sale of a "retrofit fixture" is made of of the following, everything listed except for the extra bulbs (of course they arent actually mounted, but they are included!) are mounted to a wood rig that can be hung or mounted inside of a canopy, it is wired and working. It was used over the course of two years on my 120gallon but I recently switched to LED.
two Single-ended 250Watt 14k metal halide bulbs (about 8 months use on them)
two mogul-socket bases with reflectors
two individually switchable metal halide ballasts (inside of one large ballast box)
four t5ho moisture resistant endcaps
two 48" Tek t5ho reflectors
four T5HO UVL super actinic 48" bulbs (two about 8 months use, two brand new only test fired.)
one t5HO ballast
four sets of two moonlighting pods of blue LEDs + power supply for said LEDs.
I may have forgotten something in the list but lets just say this is a complete halide + t5 suppliment with moonlight fixture and can serve pretty much any 4ft tank.
I can deliver to the MASM MONSTER SWAP if interested.