Thanks for the replies my existing radiator is a 111 500 10 03 and at 595mm it is 23 inches wide so it looks like the 280 radiator with side mounted oil cooler is 3.25 inches wider than my existing so doesnt look like it will fit the 250 SE front panel.

If I get chance I might go and see this 280 radiator and take my existing one with me to compare them.

thanks again for the information much appreciated