You know... this is the most odd thing. I was just about to post the very same questions. Only I was looking at this page for front turn signals.

http://www.superbrightleds.com/1157.htm

RL-650 Load Resistor kit
$ 4.95

At least this is what I was looking at for turn signals.
My question was going to ask if I needed these on my Mercury Mystique 98? Or if there was something else cheaper or easy.