Thanks for the info. I will definately check it out. I did remove the cover off my fixture and the bulb had a round end.
I did an online search and didn't realize how many different 12v LED bulbs there are.
I did find one guy on Youtube that demoed replacing his bulbs (looked just like mine), and of course he had the volt meter thing to show the power dip between the LED and regular bulbs.
He also showed the LED bulb he used (flat disc shaped with two prongs), and the wattage size and the website where he bought it. They aren't quite as expensive as I thought, but can see it would be if I replaced ALL my old bulbs!