I have some additional information which a member asked me for regarding the size of the arm.
From the paperwork with this it appears to be a non standard model with dimensions as follows A=430 B=342 H=45

http://www.renishaw.com/media/pdf/en...0eb60d98e9.pdf

The arm is an HPMA GMSTR A430 B342 H45
Product = A-2181-0001
Description MPMA R/E GILDEMEISTER KIT

The probe is an RP3Probe Assembly
Product = A-2197-0004

I couldn't edit my post for some reason to include this update?