I have the pattern, but haven't started. I looked around here for the pattern but can't find it. Wow, what a surprise
Anyway, the bloc loc kite in a square ruler is a one trick pony. The template will only make a single size (a 3" or 4"), so you would trim this patch to the size of the template. Looking at the pattern, the half rectangle is the same length as the kite. If the pattern tells you to get the 3" (finished) kite, then you would trim your rectangle to 3.5 X 2. If they tell you to get the 4" (finished) kite then you would trim to 4.5 x 2.5"
If you don't have the rulers, I'm not sure how you will do the kite. You can look online to see if you can find instructions for the kite patch, or draft a paper pieced pattern.