Frank, I always get a number of different parts offered and not all are OEM. Some are much cheaper. Like buying anything else, you need to be aware that not all quality is the same. Of course, you've already determined that the hard way. Personally, I can't imagine buying race parts from them unless it's the same part # as OEM.
But, I'm not getting a fee from them for recommending their parts. So, buyer beware. If it looks to good to be true, it may not be!
But, the same Autolite plugs and switches I just got from them were a heck of lot cheaper than Ford or even Pep Boys. Plus, they were delivered to my house without me having to endure customer no service at my local Pep Boys, Advance Auto, pick one.