How fast did the die dulling occur? I've seen 100% production line original A12 filters with the flared holes, this was one of the first applications for these filters. I've seen s good number of original 69-71 cars that still had the original filters (survivors) and I've never seen one example with the flat screen holes. Not saying they didn't exist but they seem to be the exception, or rarity, not the rule or norm, accordingly I'd prefer having one with the flares. Can you make that style?