Hi guys - I am changing my standard trim rings and lighting over on my 89' Heritage. I have just added newer clear lens driving lights

and i am adding a freight train nacelle and i want to put a newer clear lens 7" headlight. All the parts listings for this light say from 2000' up. is this bexcause of wiring configurations

or does it have different mounting? does anyone have any advice on parts etc or who i could call for info