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TMI or Distinctive Industries. Both are good as far as I know. I have Distinctive Industries and seats have held up well for a few years now.

You will probably have to ask the individual Mustang houses who their suppliers are to find out though. Don't worry too much about minor cost differences. The labor expended to remove/install the upholstry/carpet/dash/door panels/headliner is enough that you will want the best material available.

Scott Drake makes excellent repro door handles and window cranks as well as many other small items.

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