Hey, thanks for the response.
The problem is that this is a hybrid one, uses both in reality (RTV + little rubber strip near the transmission side). The issue is that instruction videos never even tell about the rubber gasket near the transmission side. The RTV comes top of the gasket, but if it's missing there's a nice gap, roughly 2mm in depth.
I just understood that I had to scrape all old RTV material out and did the same to the gasket strip..
Argh what to do. If I don't find a part number, I need to cut out some cork and make a gasket out of it..
The only thing that reads on the gasket is 'AEM', nothing else. If this is only available with the engine block, there's no hope for the original part..