I made rear work lights for my TC40A with tractor lights from WalMart, toggle switch from Home Depot, rubber cover for toggle switch from Loew's and used a 13" long piece of 1 1/2 x 1/8 steel for the bracket. Drill to match the two bolts holding the red/amber lights and mount inside the ROPS. Below the lowest bolt, bend to horizontal the last 4", drill and mount the light. Tie-wrap wire to ROPS to plug at bottom. Ditto on the trailer plug; you get two ends in one package. The wire coming out of the harness for the work lights is one black and one yellow in a two pin male/female rubber connector, tie wrapped to the harness and laying on top of the axle near the base of the ROPS.
I drilled a hole in the lower side of the light housing to accomodate the switch ( use the smallest toggle with wires attached) and covered it with the waterproof boot..
Good luck