[urq] Aux radiator in-outlet diameter?

[Maurits Jonkergouw]

If you have a (spare/worn) aux radiator somewhere in your garage, please dig it up and measure the outer in- and outlet diameters of the 'pipes' for me? (in mm or inches). I believe they have both different diameters. BTW how do you call them (the pipes) in proper 'automotive-english'?
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Regards,
Maurits

'86 quattro GV (WR)
'85 coupé KV
'82 coupé DD