If I'm reading the ad correctly, the purple shell is presumably the ex-Gravett car. Rodrigues ran it in a number of rounds of the Portuguese touring car championship and at Macau as late as 1994- there are a couple of pics in the 1994 Touring Car World annual showing the car in the purple 'Gianfranco' colourscheme. Incidentally, it seems to have been converted to LHD
It can be seen briefly at about 1m10 in this Youtube clip of Macau '94-
http://www.youtube.com/watch?v=xagxYqXr5fo
there are 4 more parts of Macau 1994 on Youtube, so it probably turns up in some of the others as well- I haven't watched them all yet. Rodrigues finished 10th in both races.