The F18 is 55mm longer, you will need to MOD the battery tray and maybe one long-side battery hold down lip. Redtops will fit and do work. The EP 450 can't be jiggered - get it de-sloughed on a 9 stage charger. - lifestyle - frequent use - winter starts - duration [50 miles every other day] of recharge from the alternator - no intervention needed- lifestyle - infrequent use - semi-permanent advanced microprocessor controlled battery charger, the excellent MP7428 9 stage @ about £30 is an alternative to the double the price CTEK 5.0- the buttonMOD works well, is safe and will give a lot more aH in a short charge time window- 4 years ago Best of luck.