Hello. Restoring a 74 CB125 B6, the air filters needs to be replaced. I've read up that the carbs are very picky with these things and that the original filters works best with the original carbs. Problem is, OEM filters are not in production and is really hard to find. I guess this is a problem with a lot of other models aswell. Are there any after market alternatives that would work? Any recomendations?