You'll need a rad from 2L mk2. Best to get it looked at by Valley Radiator Services (very good guys and cheap!) then get some brackets off a 1600 radiator, mount them in reverse onto the 2L rad. Valley Radiator services did this for me about 12 months ago so he'll know exactly what you're asking for :)
Biggest job is welding in the angle section below the radiator, these panels are readily available. The top lip can simply be measured, marked & trimmed if need be, then tapped back. Keep the gap as small as possible to ensure air flows through the rad core, not over the top through the gap!