The "L" is a touch too short to cover the 1940. The "xl" will be a touch too long. Easy enough to remove material, though. I just use the "L" size. The 1/4 inch or so uncovered doesn't bother me. :)
wouldnt happen to have a picture of a blue one huh? is it gonne be a light blue or dark? probably wouldnt look to good if the heatsink was a light blue with a dark blue wanderer :p