Need Help Selecting a Dimmer Switch for a Low Voltage Magnetic Transformer

Hi Everyone, I need some help choosing the correct dimmer for a lighting fixture in my home, which is connected to a low voltage magnetic transformer. I live in Canada. I have provided all the information I know about the electrical system. Fixture Information: - 9 bulbs, each is 20W and 12V - MR16 halogen bulbs - Made in Italy by Solzi Luc Transformer Information: