Firebirdcentral’s customer service replied with this link after I had sent an email explicitly stating my engine and carb combination. From having a look at pictures showing long branch manifolds the thickness of the bolt hole spots look very similar to my ones. So the layouts of standard and long branch manifolds appear similar where they are mounted to the heads, diverging more and more towards the exhaust. If you wonder why I not only remove the bolts, measure them and order afterwards, shipping to Germany takes 2 weeks - of course, returning wrong parts is rather not feasible. Thus, I prefer to order in advance, which requires a bit more verification upfront.
