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Locking Gas Cap Solution for S30 that worksRecently a thread appeared that discussed locking gas caps, or more specifically the lack of a solution. The only known cap (from 70's BMW 2002) fits and appears to lock, but doesn't actually lock to the car. I was able to come up with a solution that modifies the fuel filler ring to allow the locking tab on the BMW cap to have a place to lock against. My locking gas cap solution works for the Z's up to the 74 260. The key is to look and see how many screws hold the filler ring to the body. If it has three screws, the solution is simple. If it has four, then the solution still works but is more difficult to implement. Note this solution does not work on the smaller caps found on 77-78 280's. I have a small collection of fuel filler rings that I have modified to work with the BMW locking caps that can offer for sale. I can paint, powder coat or have them CAD plated. I also made a pretty good deal on some of these locking gas caps. This allows me to offer a complete solution at a pretty good price. I'm asking $99 USD for a modified powder coated filler neck ring + new locking BMW cap with 2 keys AND a new hand made rubber gas cap protection flap. Shipping is on you. While supplies last. Here is what I am doing so can understand the value of what I'm offering for the $$. Sandblast the filler ring, weld on the lock stop blob in "just" the right spot. Do a little hammer work around the inside ID to open it slightly so the cap fits better. Powder coat. The new locking caps I just bought need a little shining up to look good, so a quick trip past the buffing wheel. The two locator tabs on these new caps are slightly long and don't fit into our filler ring as is, so grind off a tad of their length and dress them up. Test fit. Slice up a new rubber flap. Package and ship. You will have to use the flat rubber sealing ring from your old stock cap in place of the BMW sealing ring. It's too thin. One interesting note. There are two different outer diameters of the filler neck rings. Same bolt circle and same size where the cap fits, just the outer diameter of the mounting flange is different by about 1/8". Early and Late? The caps with the pie crust edge (early non-vented) verses the caps with the angle iron handle (late)? Anybody know for sure? If you care, let me know which one you want. If you have a 280 and have a four screw filler neck, you have to remove the entire neck and its one-piece upper hose tubing (see above pics) to do the "mod" to get the cap to fit. If you want to know what to do, let me know, I'll share a solution to add the "stop" to make the BMW cap work. If you're really desparate send me your neck I'll do it. I can supply the BMW locking cap or tell you where to get one. You can contact best by dropping me an email to [email protected] Let me know if you have any questions. Pictures of the items in question follow.