pillar taps

I want to replace my existing individual bath taps with a bath shower mixer. The Bristan tap I am considering has 180mm spacing for the hole centres. When I measure my existing taps, centre to centre I measure 172mm or 6 3/4 inches. Do you think it will fit? If not what can I do? Picture as...

Hello Folks, Mum & Dad have "Markwik High Neck Pillar Taps" on their kitchen sink and the hot tap turns on too easily; i.e. it comes back on unless you really push it closed. They had someone look at them but he left saying "I'll have to look it up" and never returned. Now I'm trying to DIM...