Domi Racer has a probably the most extensive in parts for the Premiers. I have not ordered any parts for mine yet from them. they were nice enough to send me some copies of an exploded parts diagram they had so I can figure out what parts are what in their listings.
I have had mine about a year and religiously watch ebay for parts and bikes. Seen one bike go up and one side cover and thats about it Very scarce bike.
If you are going to restore keep in touch with me, I was told that Domi did have repro tank decals at one time and were currently out. Thinking if we gang up on them they may make a few for us
Heres mine, it will be undergoing a full custom/resto hopefully soon. These bikes are really rare and pretty fast, but have no following. so Instead of restoring to stock I'm going to try and make a mini cafe racer out of it