Each topside has their own size hole specs.
Below you will see the size specs for the 2 topside style choices that the C5 offers.
Any of the topsides will operate the C5 unit BUT different size and features are
incorporated in a particular topside control.
Compare the size hole your old
topside leaves. The size shown are the outside dimensions. If you want a
smaller topside but the hole is too large, you can purchase a "blank" that will
cover the remaining part of the hole. You install the new blank over the
existing larger hole and then your new topside. Blanks are black in color. You
can either get a full blank and you cut the proper hole (for the large topside)
or custom cut blanks for the standard and T8s topsides.