Defender hoop roll bar on a series

Is the rear chassis lay out and tub dimensions similar enough to a defender to allow a defender hoop roll cage to be fitted to a series without too much adaptation?

Off-roading with no roof is a bit on the scarry side when you get it on two wheels - the highest point is my head if it goes over... (i'm quite fond of my head, so not got any real plans to loose it anytime soon)

Anyone?
Only got about 30 mins left on the auction...

buckshot has just done a roll bar yer might wanna pm him

Cheers i shall try him