lots of problems fitting them have a look in this forum for info
http://www.opelgt.com/forums/aftermarket-side-draft-carbs/
http://www.opelgt.com/forums/aftermarket-side-draft-carbs/
The one that I am using has a very low profile - no clearance problem. I bought it at Eurocarb Ltd Dell'Orto from U.K. At current US Dollar exchange rate, the price including shipping is approx. US$ 120.00. Not cheap but I like dual cable reliability. Also, it allowed me to remove the most of complex standard linkage.What sort of linkage can I use (what is best) for two double Weber 45DCOE in my Opel GT? Is there any problems with space under the hood?