[bpmilne]

The thing that always worked great for me was to buy my competitors product, take it apart, and see who made it or look for names / SKU's / notations I could google. You may be able to find this out just by browsing OEM web sites who advertise their clients.

From there I always had a great starting point for where to start looking. I did this largely because I never wanted to be the test pilot for a new OEM after some bad experiences.

Always visit the factory... It's the best money you'll spend with this sort of project even if you don't give them a PO.