People seem to rate the Ultra Racing bits in the Alfa community, very high quality they say, only issues being poor delivery times from Malaysia or wherever the factory is.
I've got a rear upper bar in my wagon and it's fine, light (less than a kilo) and seemingly strong. It did need its mounting holes 'modifying' a bit though as this bar (obviously very different to the saloons) is a very tight fit.
https://farm4.staticflickr.com/3938/...44b19161_b.jpgUltra Racing Rear Strut 002 by
AcidicDavey, on Flickr
It should fit fine Jamesy, mine was 'only for 855s' ;)