Where to buy online parts

Hello, I am new to this whole forum thing..
I have a 1993 Honda TRX 350 fourwheel drive and not anywhere online can I find parts for this Atv and it’s driving me insane, so I figured someone on here must know where I can find parts? Anyone knowing anything would sure be great if you could help me out!
Specifically I am looking for a starter, I am wondering if older or newer models have compatible parts?
And yes I am certain that it is a 93 TRX 350 Honda without doubt.