So your ready to purchase my special combination offer.  How do you know which size wood curb border to order?  There are two borders to choose from.  One wood border works with 3" high curb painting stencils and the other works with 4" high curb painting stencils.  The wood border made for use with the 3" high stencils will work in all neighborhoods where the curb height is at least 4 ½".  If your not sure which curb border to purchase, play it safe and go with the wood border made for use with the 3" high numbering.  You can always buy the border for use with the 4" high curb painting stencils if you find you are curb painting in areas where the curbs will allow you to use larger stencils.  The wood border for use with 4" high number curb paint stencils is approximately 1/3 larger than the other border so of course it works better if the side walk is tall enough to use it on.  How tall does the side walk need to be in order to use the wood border made for 4" high number curb painting stencils?  The curb needs to be at least 5 ½" high to use the larger border effectively. 
Note:  In my course I will tell you exactly where to purchase both the 3" and 4" high curb painting stencils.