Gary,
On your condenser the four tabs appear to project about 1/2", while on the one from PRC they extend more like 4". You can easily take pieces of aluminum stock, nominal 1/8" thick, 2"x4" or so and attach them to the existing tabs with small bolts & nuts. Then drill holes to align with your outer frame, tap the ones in the outer frame and bolt them in place. Piece of cake.