1. Re-drill floorboards and bring pipes up, say, 20mm further out from radiator each side. OR
2. Bend / use fittings, to bring existing pipes out.
Don't forget the centres of the pipes where they enter the radiator valves may be further off the wall than the existing ones, so you may have additional pipe manipulation to do.
Do not be tempted to use flexible hoses - they can't take the temperature and will fail quite quickly.
Normally you would alter pipework under floor if accessible/located there. Other than that as the new rad is longer than the old one, you will have to alter the tails by probably adding a couple elbows at at least one tail or both.
Other than draining off and re piping no. Easy option is to go for a 1600 and use chrome extensions either side, looks abit of a dogs dinner though imho.
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