Okay, I'll bite… exactly WHY are those other parts "illegal"? You say they don't have the Ford logo, and I assume they are not sold in such a manner as to make the customer think they were genuine Ford parts. So it that's true, then how would those parts be any more illegal than any other car part made by a third party manufacturer? Toyota tells me in the owners manual that I should only use genuine Toyota parts and have service work done at Toyota dealers, but I ignore both of those because I go to a family-owned oil change business that's been serving the local area for years. They probably wouldn't know a genuine Toyota oil filter if they tripped over one and yet I've never had a problem with any filter they have installed. They do use brand name filters, just not made by the car manufacturer, and there is nothing illegal about it no matter how much the car manufacturer or any dealer might not like it.
Frankly, if I owned an old Ford (which I wouldn't) and a parts dealer tried to tell me that I could not purchase aftermarket parts for my car, that dealer would immediately be on my sh*t list of people I would never do business with. If they were the only source left for a part for my car, I'd sell the thing or take it to the junkyard before I'd buy a part from that dealer. Until then, every time I bought a part for my car from someone else, I'd mentally be picturing me giving that dealer an upraised middle finger! Of course that would not apply in a situation where a customer indicates some desire to only purchase genuine parts, but then again, your parts weren't made in the original Ford factory so I guess I don't see much of a difference - just because Ford gives you their blessing as a maker of parts would not necessarily indicate to me that your parts are of better quality than parts made by any other supplier. Anyway, I just don't understand why you'd use the word "illegal" to describe those other parts - unless there is some law I'm not aware of that specifically makes it illegal to make aftermarket parts for old Fords, then those parts are no more illegal than the aftermarket muffler you buy at a muffler shop, and it seems to me like it would be rather disingenuous to try and convince your potential customers otherwise (and you are probably shooting yourself in the foot if you try to do so).
I think this is a great illustration of why there are such divergent opinions on topics such as this. For some reason, in the USA we have somehow developed a culture where certain people in business think they are entitled to have captive customers that legally have to buy from them. Mostly it's wishful thinking on their part. Just as a seller of "authorized" car parts might wish it were illegal for potential customers to buy the aftermarket parts, but objectively that's simply not the case, so too I keep wondering if the dealers that would have us believe that certain satellite receivers are illegal are simply blowing smoke and engaging in wishful thinking. But also, the more that certain dealers start sounding like they think they are entitled to have business because they sell only fully "legal" receivers, the more inclined I am to think that's a dealer I never want to do business with. I buy from someone because I like them and want to do business with them, and because they offer a product I want at a good price. I don't buy from people I don't like, and I especially don't buy from people that I feel may be trying to deceive me in some way just so they can possibly get some of my money. It's the reason that when there was a recall on my car, I drove right past the nearest dealer and went another 30 miles to get to the next nearest one. The local dealer tried to rip me off once and that was their one shot; they will never get another chance, and there isn't a snowball's chance in Hades that they will ever sell me a car!
