This Oil Cooler Kit Is For F series .
I have had higher quaity gaskets made for this application to eliminate the splitting that some folks have had with the thin OE and Aftermarket gaskets.
The green O-Rings are OEM Ford
The Smaller are viton for better heat resistance.
I reccommend spraying both gaskets with high tack on the block side and using Aviation sealer or Red anerobic on the the header side.
Do Not use RTV of any type.