That is the Purple series C Rapide, the bike I 'A-ised' is my Series B Rapide. The C was re-painted black and put back to almost standard when I sold it in 1971 - although it still had 2 front heads, Lightning-sized wheels, Shadow carbs and Mk II cams!! I kept the Bramptons, 8" headlamp and Lightning brakes for my B - I already had the crankcases and covers at that time. Pleased to say my original C is now back in the North Kent section !!Is that a photo of the bike you altered to look like a series a.
Is it the purple one or are they one and the same?
Ossie
Here's the nearside of the C, showing the location of the compressor for the Maserati air horns.