Great news, Ivan!
I like both 7x and 6.25x space bars because each of them can fit on the right board for the right job.
7x space bar is great but it may only go with Cherry stabilizers (to make it work with Costa, we may end up with modding the plate heavily). For me, 7x space bar delivers a better sound, plus working with Ctrl, Alt 1.5x-A profile but it is easier to get wobble and inconsistency (nevertheless I can work around it easily with a bit teflon tape)
6.25x is also great on contemporary keyboards like Filco, Ducky. It takes the advantages of Costa stabilizers, has great feeling, more consistency, but we need to face smaller Ctrl, Alt (1.25)-B profile which is less ideal than the mentioned above. I just feel like the bottom row of 6.25x keyboard always has more keys than I need, I rarely use the Windows and the Application key actually.
I hope my package will have nice colour, otherwise I may need to trade them with the colour that I need.