Join Date: Feb 2012
Location: Sisters, Oregon
Brian is correct regarding the mounting location. The proper location has been moved. Your photo is upside down but the threaded hole inboard is where the threaded bolt should go. The bushing is too far outboard. If your Alfa is not lowered you can probably get by without a guard. Since the sump sits a couple inches forward of the tires, the guard was originally used to prevent damage in the event of striking a curb during "head in parking".
I have personally struck a large rock which did significant damage to the guard, not the sump. Track use, even club events, can lead to off course excusions. I have seen sumps disfigured by manhole covers.
So, if primarily touring, then the guard may not be needed. If you are aggressive, maybe it's a good idea.
1974 GTV (1969 Tribute)
1993 Spider ( project)
1964 Giulia Sprint. 1966 Giulietta 101 Sprint
1967 Super 1968 GTV 1974 Berlina
1979 Alfetta Mille Miglia 1987 Milano
1953 MGTD 1958 TR3 1962 AH 3000 MKII