Hi
There is a thread in the wheels and Tyres section about this, (had what offset in the title I think???)
I am running Rota 15x7" rims, with an ET 15 (offset). These just fit, but in hindsight an ET of 20mm would have been better, as there is ample clearance to the struts on the inside, but to run 205 Tyres on the rear you will have to roll the inner lip of the wheel arch of a coupe, but mine is a Series 1 coupe, not sure if there is any difference with the VX, but I doubt it. I did away with std Lancia spacers and used new shorter bolts, so wheels sit straight up against discs.
Tyres are 205/50 x 15 Toyo R888 semi slicks in medium compound, which are also available in 195/55x15 and 215/50 x15.
I originally ran 185/60x14 Toyo R888 on the std Lancia alloys, but the difference with the larger rim/Tyres was worth 3secs at my Local hillclimb....
Regards
Ian