i would recommend to use a mercedes 190e rad from 82-93 petrol manual upto 2.3l no A/C with the core size 293x343 (45mm thick) it has 2 inline 30mm in/outlets and a drain tap. mine was reasonably cheap (about £50) you will also need 2 90deg bend hoses
its small and thick and should be big enough core wise to cool anything that will fit in the roadster and fits nicely with masses of room in the nose cone
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