My bad, I was not aware there was differences and I thought the one I posted was not a memory remote eaither. There was another ad on ebay for one like it for $39 that said would work on the 97-98 Mark VIII and didnt have the memory function. Also a couple months back I sold my CD changer to a dude with a 98 Mark and when he pulled his remote out I saw it was square (it was night so not sure if was gray or black) and I asked him what it was from. He said it was eaither a 98 or 99 Mustang but couldnt remember which year for sure.
Its the code hoping that needs to be compatable and that changed every couple years. The memory function has nothing to do with the frequency transmition of the remote.
Now you really have me curious, does your manual rule out a remote because it lacks the memory function? Does it say something like "Will work but lacks memory" or is it just a yes/no kinda thing?