For the 20002 BMW Alpina see where the intermittent relay is located because many American vehicles with intermittent relays had them on the wiper motor rather than in the switch, especially trucks. You may have to replace some parts to get the intermittent relay to work properly again. Get together with an electronics repair person especially someone that used to repair radios or televisions. They have the expertise to repair this type of relay. If you are a diehard DIY then do a deep dive to find out how they work and build one. Stick it into the place where the original was located. I have a 50 year old Euro Super Beetle with things the North American versions never got like disc brakes. I had a hell of a time finding the parts to rebuild my calipers. After buying them from a place in the UK I found out I could have gotten them for less at MTManufacturing. Grill for a Chrysler, try additive manufacturing. What you use or hire someone to do for you is 3-D CAD to create the part on a computer and then to check it you have it printed in plastic. Then you will have to decide whether you want to use subtractive or additive manufacturing to make the grill. You could have it cut from stainless steel and then polish the faces or the plastic could be used to have it cast, etc. and plated. Don't think of it as a solid finished part but think of the individual pieces then put them together. The bumpers are a similar problem I am having with my Super Beetle. I could use the available bumper with the poor plating but I would like stronger and non-rusting polished bumpers. I looked at the shapes of the bumper if I had to make it from pieces. The top and bottom plates can be cut to the proper shape with a water jet and using stainless steel. The face of the bumper has a low center where a rubber bumper rub strip is located. So the face is made with a plate that then has two narrower strip welded to the face after bending to the shape to match the top and bottom faces. Then the narrow strips are welded to the face and the upper and lower plates respectively. Use stainless for all the pieces and TIG weld it to create nicely shaped top and bottom welded edges. Then the entire bumper is polished. As a welded unit the new bumper will be much stronger and stiffer than if it was formed. Regarding upholstery. When I was restoring my 1951 Studebaker in the 1970s I was dismayed to discover that the striped upholstery was no longer available. Imagine my surprise when I cannot find the correct 10-wale polyester and nylon blend corduroy to repair the seats in my 1972 VW Super Beetle. I just need the 10-wale corduroy because I can dye it the correct color, but corduroy seems to no longer be popular for clothing or for upholstery. Interior parts can be made if you can recreate them in a 3-D CAD program. To get you started for less try something like Rhino.
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