997 GT3 4.0 intake part numbers

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Hello all,

for the 4.0 engine, there are 2 part numbers for the M97.74. One is also used for the M97.77.
I'd like to know which one should be used for my 4.0 engine build.

Used for both engines:
99711061991 intake distributor cyl. 1 - 3
99711062091 Intake 4 - 6
M 61B 31503


99711061992 intake distributor cyl. 1 - 3
99711062092 Intake 4 - 6
M 61B 31504 >>


There are no pictures I can find of the differences either.

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for anyone else searching later:

These are the ones to use:
99711061992 intake distributor cyl. 1 - 3
99711062092 Intake 4 - 6
M 61B 31504 >>