Week oil pressure check spring? Replace it today with our new English made spring. Spring will replace BSA part number 68-0353 & 68-353. Fits BSA A50 / A65 models from 1962-1969 fitted with the "original" style unit that can accept a ball bearing and spring - will not work with units that have the later "piston" valves. Check your parts book to ensure the best fitment.