@Stan Galat- The 36IDF was never part of any aftermarket VW 'kit' so you don't see them very often, but as I said, they are around. They would be the perfect size for a hotrodded bigbore 36 hp engine with Okrasa style dual port heads (which are made) or even a mild 1600. I don't think I've ever actually seen a set (or even 1 carb) at a swap meet or VW gathering; I'm pretty sure I just read somewhere that they exist and have seen them for sale on Ebay. As a matter of fact- https://www.ebay.com/itm/weber...9:g:lD4AAOSwS6FflEZF
I have no idea what they originally came on. Al
PS- just found out they'd be take offs from some Alfa Romeo...
And another PS - Here are New old stock for sale- https://www.dellorto.co.uk/sho...-idfs-new-old-stock/ Note that they're left handed carbs only (I'm guessing the Alfa they were originally on was a straight 4 or maybe a 6?) and 1 would have to be switched to work on an opposed 4. And surprisingly enough, they come with 32mm venturiis.
Just to keep your head spinning- there's also a 50IDF...