This is one of our favorite inventions. Over the years, we've changed a ton of cars back and forth from Top Sportsman trim to Super gas trim and vise versa. One thing that people often do wrong when they change tire sizes or ride height is to jack up the front springs to get the ride height where they please. This is a less than ideal fix. When building a strut front end car, you have to keep in mind the relatively short stroke of the strut. For example, Strange Engineering suggests to mount their struts with only 3/8" of shaft showing so that you get the full amount of up travel to make the car transfer the weight to the rear. If you jack your struts up you take all of that away and the struts will top out and lose your weight transfer.
With our kit you can design your car around the normal tire size (say a 25" tall front tire) with the shortest insert of the three spacers. When in need of a reduced rollout you will be changing to a smaller tire and then use the longer insert make up the difference in tire size but still keep your stroke on the shock.