"4-Core" Radiator the only real "4-core" radiator available today is supplied by MiniSpares of London with a drain hole and plug- this hole also accepts the sender unit as used on later cars from 1991 which is available as
C-ARA4446 kit. Their design has been proven to be the best 4-core at cooling. Others both in the States and abroad have tried to copy but none work as well as the "real" thing! May require minor modifications if ever fitted to a 2-piece radiator shroud as fitted to Mk I/II.