I guess by pulsations dial you mean mean pulsations bezel; one of the four main options (still) available for the Speedmaster Professional. You can get the parts from Omega and (in my experience) if the OB has a watchmaker the swap can be done on-site. I had my Tachy bezel swapped for a decimal one.
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The decimal bezel Omega part number shown above is 082ST1450012DE
There are pulsations dials (Seamaster, Chronostop...) but I can only remember seeing one Speedmaster with such a dial, the Rattrapante. This thread might interest you:-
https://omegaforums.net/threads/what-are-some-interesting-pulsation-dial-watches.69794/