New Amal Monobloc Air Adjusting Screw & Spring. This screw and spring set is made by the original manufacture in England – Amal. Replaces Amal part number 322/017 and 4/148. Fits all new and original Amal Monobloc carbs (375, 376, 389, 689, etc) as fitted to most BSA, Triumph, Norton, Matchless, AJS & other British Brands from approx 1954-1967. Please refer to your parts book to ensure the best fitment.Made in EnglandO.E.M Part number is RKC/513, 322/017 and 4/148