Electric windows were standard on Campaigns.
I think, but I'm not sure, 8v didn't have electric windows as standard, but the Campaign did.
I' afraid I have no idea about the alarm. Mine had an alarm - complete pain in the neck - so it was soon retired. I think they were after thought add ons as Golfs in that era were prone to being nicked.
The changes were purely cosmetic, but two of the changes found their way on to the late 91 models (3 stripe interior, blacked out rear lights).
I will take some pictures of mine but its in a shocking state at the moment, with the front wheels removed and the wheel hubs off.
This week its getting new rubber bits on its steering stuff, new ball joints, a host of other things that i have no idea what there, and I'm about to order today new suspension struts front and rear.
By the end of next week it should have a new Mot and ready to go to the body shop.
When it has had its body work done (bare metal respray, 4 new panels) I will take a picture ;-)
Regards,
Justin