Monza wheel base's dimensions?

[Oops01]

Hi all, I have a Fanatec CSL Elite wheel base and 3 pedals CSL v1 set, I'm toying with the idea of upgrading to the Monza wheelbase. The main reason for Monza is simply because I don't have a lot of room (clearance) in my cockpit (self-built) I only have 155mm between where my wheel is clamped to where the top of the cockpit is.
So I was looking at the two entry-level Monza wheelbases, according to Overclockers site the R5's dimensions are:- 268 x 205 x 294 mm (W x H x D) but the R9's dimensions are:- 157 x 124 x 240 mm (W x H x D) so according to Overclockers the R5 wouldn't fit into my cockpit (without adaption) but the R9 will, can anyone verify this?