360 magnum question

Hi, I've done some searches on here and pretty much answered all my questions. Much better site for SB topics then any others.

I have one question regarding my 360 Magnum. I have to buy a flex plate for it because i threw out the one from the motor.... my issue is its a 94 or 95 engine and the flex plate is a different part # then 96+ magnums.
So because i'm putting a Profession products dampener on #80012 balanced for 360 magnum, should i use 96+ flex plate with my neutral torque converter?
Just wondering if they weighted them differently for the first years compared to later? I dont want a harmonic vibration later on.

Thanks