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Air Filter to SU Carb - Bolt Size

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Happy Christmas ... my first day in the garage for nearly 5 weeks sees me hit all kinds of frustrations ... but I know you guys will love some distraction from the family Christmas

I recently got two K&N Air Filters from Ebay for my 1 1/4 SU HS2 ( Spitfire MKII ) - but the bolts supplied don't seem to fit the casting on the carb body - The original air filter box was attached with 4 x HB867 - longish bolts ... I need the equivalent threaded bolts short enough to fit inside the K&N units.

The originals look like UNC - but can anyone tell me the bits I need before I buy lots of random bolts - Thanks

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