That worked! I used gmaptool and merged both canada and mexico into one file called gmapsupp.img and placed on SD card in garmin directory! Map info now says:
CN North America NT 2010.30 - Checked
[1] Canada_mexico
[2] north america 2010 30 unlocked

Weird how I had to merge both to get my 255 to see it. I used the same exact filename when doing them separate. Appreciate your help!