This cute card can be found on page 75 of the handbook, which is the Happy Father's Day/ #1 Dad themed key.
My tip for making sure that the card fits the envelope: Cut the envelope on 'fit to page' and then it will tell you what size to cut the card! In this case, it said 4 3/4", so that's what size I cut the card, tie, and pocket shapes. You can see that the envelope ends up actually being 5 1/4" square, and the card itself is 4 3/4" so it fits the envelope perfectly! Don't forget that you also cut the coordinating shapes at the same size so they will automatically adjust to fit that card size.
I inked the edges of all the shapes with my favorite new Slate ink. The paper I used is double sided to make it quick and easy. I think any dad in your life would get a kick out of receiving this card!