I am working on Thangles Series 7 Buck a Block. On the back of one of the patterns they have a chart that shows that block (no pattern) but the sizes of the blocks that you can make. It is a 12" finished block with 36 units (half square triangles and 4 solid squares) using the 2" (2.5" strip)size Thangles. If you want a 9" finished block you would use a 1.5" Thangle.
Also, the patterns that they give with the Buck a Block programs just have the measurements, how many HST units to make and a picture of the block. So it is pretty easy to figure out. 32 HSTs and 4 solid squares. Just make up the units and then lay them out in the block design and then sew them row by row.