cut off the sides from the bumper support and bolt them on around the radiator. then make brackets to extend off of that and there you go. if no you could make brackets extending up to the bolts holding on the headlight or something and mount it like that. use your creativity.

 

How about this:

 

What kinda car (s13, S14, stock bumper, Body kit.. etc..)

i might get the ARC oil cooler, which goes behide my Grill (S13 Silvia front) and it also comes with a mesh grill to allow air flow

 

But what I'm really intersted in doing is putting the oil cooler next to the FMIC up front on the bumper such as this Blitz Skyline:

If this is what you're set on doing, it's going to take custom bracketry to hold it in place. Not so hard I'd think, for even a semi-experienced fabricator.

What chassis do you have? IMO, despite the other suggestions, the best place to put it on a S13 is in the stock battery location. Duct air in through the headlight cover or up through the bumper, and duct it out the hood. This is my plan. :thumbsup

 

What kinda car (s13, S14, stock bumper, Body kit.. etc..)

S14 Kouki w/ JDM front kouki bumper.

Looks like the locations that SXSE240 has displayed seems to be the easiest and best way. Also saves room. But wouldn't you want any airflow?

 

another good spot is either where the factory intercooler normally goes or where the washer bottle sits.