$5/12"...here's a thread to check out for more info:

http://www.suzukiquadracerhq.com/lt500-general-discussion/chrisg-led-light-arrived/msg19246/#msg19246


I'm going to tentatively say that the LED's will work and need no modification.
They're plug and play, but you'll need to find a way to mount them to your quad, and you also need to be sure that your voltage regulator is working properly.
If you replace the stock lighting coils in your LT with Ricky Stator's 130W coils, you'll have a lot more options.
With 130W, you might be able to light this puppy up if there were a way to mount it to the LT:
http://okledlightbars.webs.com/apps/webstore/products/show/3669919