The carbs I bought described as TRIUMPH GT6 MK III STROMBERG CD150SE

The carbs I bought described as TRIUMPH GT6 MK III STROMBERG CD150SE. The choke mechanism on the front carb is bolted onto the side of the carb, with a block between it and the carb. Question is should there be a couple of gaskets, one between the block and carb and one between the block and choke mechanism? 

There wasn’t when I received them and a small amount of fuel appears to be weeping from the join, but more serious is that this appears to be causing air to be sucked in as I can see air bubbles in the clear line from choke to rear carb when in operation causing very poor running under cold start with choke. 

I have purchased a couple of gasket kits for these carbs and they have gaskets that look like they are correct but don’t actually have the correct bolt or hole layout.

UPDATE: A call to Burlen (https://burlen.co.uk) and they’ve found a gasket for me and in the post for me to fit next weekend. Brilliant.