Go guys building a datsun with a ca18det motor just wondering way radiators where used for the build n where u guys got them from any help. Or pics would be great cheers

The cheapest option is to use an original Silvia/180SX radiator. They just fit between the captive bolts that hold the front bumper on.
Just gotta drill a couple of holes in the front chassis rail and use the S13 mounting grommets at the bottom. The best thing about them is that they are nice and thin so they leave a bit more room for thermo fans and FMIC's. Otherwise go for an ebay alloy S13 radiator....just remember in both cases that the SR20 version will have the top hose outlet on the passenger side whereas the CA18DET has top and bottom outlets on the driver side.

Dont use a stock single core s13 radiator, barely adequate for an s13- same size as n13 pulsar core lol. I replaced pulsar one with s13 and used same mounting holes etc. The core is same thickness in tubes and all. Speaking with rad guy now as I'm getting something better, r32 gtst is twin core but need to check as 15-20mm taller in core, but I'm Also looking at a Honda one as it's Also twin core- same width as s13 between rails.

cause I have a alloy one atm off a s13 ca18det n m havin trouble with it fitting in the engine bay it seems too tall length is perfect just way to tall

It's probably one of the s13 ones that's multi purpose for the r32 rb series too.
I trimmed the bottom posts so the bottom hose sits on rad support rail.
Mild man relived his bottom rail with a mallet to make his fit.
Superfatto dented his bonnet support to let it fit in his bay.

Ae 86 ones fit better but the toyota mount design sucks bad