They said they were using 881 led bulbs I believe. There is also a hid upgrade kit for these head lighs:
HID John Deere Gator RSX / XUV 57M10910 Headlight Conversion Kit, Dual, 5000K,
They say they replace a 862 or the 57m10910 JD part number. It cost 130 though.
All my bulbs say 881. So I'm just guna get 4 881 LEDs and save that 130 for a light bar. IMO