I think that your 2.5 will need a bit more welly from a battery compared to a standard Plus 4 so I’d go down a larger Odssey route. I’m sure the battery tray for the Roadster is the same ( I may be wrong!) as the Plus 4 and they take a higher capacity battery, so perhaps try that.
Unlike some, I wouldn’t have the temerity to contradict Jays. However, if you search for DaveW’s post on Banner Batteries you’ll find the specification of the one he fitted to his Roadster.
DaveW confirms Jays assertion that the tray for the Roadster is the same size as the Plus 4.
