Aaz radiator? Which one ?

Hi folks I fitted an aaz in my cabby and looking for a radiator. I picked up a new rad today from local motor factors 191 121 251C it's listed for a mk2 golf 16v , Mk2 1:6 TD was marked on the box. Anyhoo it's too big and hits off the alternator so I'll have to return it but I need to get one that will fit. Any ideas what else will work? I have max measurements of 700 mm width by 325 mm high Thanks Ger

Could you not use a standard Mk1 Golf GTi radiator as I thought Diesel engine ran cooler than petrol engines but I could be wrong…   

Thanks mate yes it actually runs the standard gti rad which is leaking I thought it looked quite small to be honest,  so I thought it was a good time to get a bigger rad