The magneto cover is a different colour to stock.
The very same bike in action below and an earlier or modified version below right. Tommi Ahvala was Diego's team mate in 1989 . He stated that Aprilia would change parts , not bikes , meaning that the bike you would be riding might have the same chassis all year around but parts would be changed to and from it continually to the suit the riders preference.
Titanium shock and linkage bolts. The rear spring in the same colour as stock however the seller note that the shock i simply amazing , with the fast rebound riders at this time needed.
This 1989 Bosis Aprilia was kept by Aprilia until 1994 when it was sold with a number of trials machines to Giulio Mauri the famous Italian photographer. He collected a number of Italian World championship winning trials bikes. Since Giulio's untimely and sad passing in 2012 some of these machines have been sold by the family.
Blue MT bars and an MT bar pad.