I've found myself an 1100 S steel air filter box. Do they use the same 'air horn' (or whatever ya call em) as a later Clubman plastic box?

It's what i've always planned on using on my van, either with HS4 or HS6/HIF44.

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You can use the later plastic Horn, I think i do have a metal one however if you preffer to use that,
By the way if You like chrome on your motor they do look good chrome plated