Hi Mike,
This is a lot better answer than I got from support as I had a ticket in as was told you don't support eBay motors in a upload file. I will test it now.
I have looked and can't find anywhere to print a numeric list of eBay categories for eBay Motors or for that mater the numeric categories for my store. I was going to download Turbo Lister to see if I could pull it from there.
Thanks for your help,
Mike