ah but if aftermarket the oil cooler would be seperate, and the questionable item would be the sandwich plate. my moneys on oem
and the sandwich plate would still be that way around, so your not trying to put two rubber seals together.
Incidentaly, what order did you put your sndwich plate & standard cooler? i went housing ->standard cooler -> sandwich -> filter
all this talk of sandwiches is mking me hungry.