You could use anything as long as the outlets are in the right place. If you can find the radiator out of a C22 Vanette with the A15 engine, this might be you're best bet, though you'd probably have to get it re-cored. It's a triple core radiator, the outlets line up if you use the Vanette hoses, & if you use the standard Sunny sides on it, you can bolt it to the standard passenger side holes, then drill 2 holes through the support panel & either use a nut & bolt or nutserts to mount the driver's side. There's a little 'cutout' on the front support panel that can be snipped out for some extra air to the radiator. You could also get an alloy radiator made up to suit. I've simply used a standard Sunny air conditioning radiator in my race car, with a 1600cc A15,etc, & never experienced any overheating, but the turbo is added heat, so a bigger radiator is always safer.