hey james,
here's some pics of 16x7 -25mm on my disco with 265/75 tyres.
Although they stick out a lot, im not sure if cutting the top of the guard will be necessary. with a narrower 245 tyre i reckon you'd be fine.
I haven't done any cutting yet (not even camel cut) so i can't flex it up to find out. It's fine for road driving without the cutting, only heard it scrape a couple times when hitting my driveway too enthusiastically :p
Will hopefully get the grinder out this weekend and see what needs to be removed. i'll be taking out as little possible
https://www.aulro.com/afvb/
http://img29.imageshack.us/img29/5798/p1000536f.th.jpg