I have a MicroSoft Excel file that does 4-link instant center calcs. But the board doesn't allow attaching.

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The files you may upload must have the following extension: .gif,.jpg,.txt,.zip,.png,.pdf,.jpeg,.JPG,.GIF

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If you would like it, email me. Here is a picture of it.
You need to put actual hole location measurements into it to match your car. Then you can change holes to see where the IC goes to.

Jim