1989/90 dt 125 r can you help me

Hi i am a newbie to this forum

can any one help me ???????? i have just brought a 1989/90 model dt 125r that has been stripped for a field bike at some point as you can imagine it has nothing on it

I know most dt's are the same but up to what age can i use parts from i have the correct engine for the bike but i need a wiring loom, headlight etc well most electrics really, plastics and most parts need sorted out

any help is greatly recieved

cheers