On this page https://www.modelfkeyboards.com/product/new-custom-legend-keycaps/ it says “Choice 3 requires ordering 1 key from this page (specify 1U Enter pebble)”, but choice 3 also uses a pebble-colored 1U + key, which as far as I can tell is *not* included in the base key set. And in fact further down the page there is a diagram with a row of 3 keys labeled “F77 Num Pad #3” containing the following pebble-colored 1U keys:
+
Enter (just the arrow icon)
=

Could you please clarify which keys are needed on top of the base key set in order to achieve Num Pad layout #3? It seems to me I need the +, and either one or both of = and Enter.