My '51 MM has the following Carb (looks similar to the one on my spare 803cc engine, but not quite[frame]

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Other side looks like this[frame]

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It is an SU carb and the ID No.s are 2298 on the Float Chamber and 3457 on the body.
Is this a H1 type? I need to get a gasket set as it leaks!
General view under the bonnet[frame]

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'50 Low-light with 918 Side-valve engine,
'51 High-light with Side-valve 918 engine,
'55 4-dr with 803 engine,
'56 Traveller with 1098 engine.