I need an air filter for a 1 barrel carb. 68 to be specific. According to SOR's web site, these are discontinued. Are these not the same air filters as the 3/69 and forward? Are there any parts guru's or 1 barrel owners who might know where I could buy a few. SOR---- AIR CLEANER 1BL-1958-2/69 DISCONTIUED Thanks All!