i know i can look rather stupid at times. when folks see me climbing up on the tractor with long handle tree trimmers / cutters. and taking out low hanging branches.
i have gotten a few good smacks from branches. enough times. that it is not about asking for permission to cut the lower limbs off. it is about staying conscious while mowing.
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as far as replacement. i am generally un-easy buying any direct manufactured piece of stuff. due to price tag normally attached. there are a lot of after market lights, a quick trip to tractor supply, farm king, farm and fleet, even an auto shop. tend to have generic lights. not sure exactly what wires you have, (brake, tail, turn single, caution) perhaps 2 or perhaps all 4 lights are in that cluster, don't know. but have seen many cheap little kits.