are you trying to remove the plastic cover?.If so there are 3 maybe 4 clips that hold it along with 3 screws .the pic you show looks to be the same style as the one in my car.The clips are around the out side carefully pry them with a screw driver I broke one of mine getting it off.

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89 Ford F3504x4CC 7.3 IDI turboed Intercooler and running on wvo now powered by a 1997 Cumins
87 300SDL on bio and wvo killed by chevy truck 5-24-06
1999 E300TD black with gray int.