One of my favorite skins from the era
1999 Williams Supertec Skin for the V10.
Both Alex Zanardi and Ralf Schumacher included, helmets are standard Reiza helmets.
The Winfield logo isn't exactly the same since the font used on the car is different than every other winfield logo i found. Other than that its fairly accurate.
Williams Supertec 1999 2016-03-24
1999 Williams Supertec Skin