I purchased a couple of Racor 500MAs to filter my system, but inadvertently purchased the type with the metric M16 ports. I purchased them a while ago, so there's no chance in returning them. The ports appear to be stainless fittings that can be removed, but I don't know if removing them will leave me with much of a different scenario. Does anyone have any idea of what the thread size might be if I removed the fittings? I've been looking all day for some kind of adapter, M16 to 3/4"-16, but I'm not having much luck. Parker has something that might work. I sent an email to Parker, but they haven't got back to me. I'd like to get them installed this weekend. Any help would be greatly appreciated.