rim size

[Abster71]

Wondering what the stock width is for front rims on 2018 defender HD8 DPS.  I'm looking to put the same size rim and tire all the way around the machine and get more of a road tire due to that's what the machine drives on and be able to rotate the tires.  If anyone as any info on replacement size rims for a stock machine that works that would be great.  I may look at just getting two front stock rims and putting them on the back as well unless it's cheaper to just get aftermarket rims.  Thanks for the help