Only one as far as i know. But very early models were slightly different.
yeah, you need a butterfly type clip to hold the valve in place, and the two new o rings, so it doesnt suck air into the system.
Yeah, got two tubes and a hole in the top, with a water bleeder at the bottom. EUro car parts or GSF would be a place to start. Else ebay... about a tenner delivered. Make sure you get two little rubber "O" ring seals with it for the anti syphon valve.
Welcome to club lupo
car pic please
I fitted the £22 eBay one (https://www.ebay.co.uk/itm/NEW-VW-LUPO-SEAT-AROSA-PASSENGER-LEFT-ELECTRIC-WINDOW-REGULATOR-REG-98-05/193484677001?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2060353.m2749.l2649) yesterday and it's actually really good.
I took my time aligning it all and it's perfect again.