<https://7173mustangs.com/forums/topic/22860-fmx-to-4-speed-swap/#comment-236799>
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"Yea, I really couldn't tell until I actually mocked up the bell housing with the z bar. Then it was real obvious. There are two basic designs being manufactured that I could find. Most are almost identical to mine( not good unless you want to mod them like I did. Hedman makes the other pattern I have seen and they clear fine. You can tell by the extended length of the tubes in front of the collector. ( they also claim it in there ad.) \n\nIf you post a pic or a link, I can probably tell you whitch ones you have. \n  \n\nK \n\n \n\n\n \n\n  \n\nThanks Dave, I did find that out just recently. Got one one the bench waiting. Hopefully going in tomorrow. Took the day off and went the northwest nationals drag races.. my ears are still buzzing.. That! Is horsepower! \n\nK \n"
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