[modern] CPS for unleaded fuel

Hi all !
Just a quick question,
How do i know that my car has the later CPS braket for unleaded fuel ???
Is there any mesure i can take to confirm if it’s the later or the earlier
one ??

87 XJ40 potentially with unleaded CPS braket ??
78 XJS without this kind of question, move the distributor 3� BTDC that’s
all !