This was taken from the old forum. Not sure of the informations validity for your case.
Nylon Push Rivet (two sizes) - 92039-0051 & 99039-0051
Push rivet under the windscreen - 92039-0048
Motosport.com Bolt Brand 6mm Nylon Push Rivet - 2005-6RIV (These may not work)
Balkamp part number 665-1446 (pkg of 9) available at NAPA for (rivet 92039-0051)
Hillman push-in Nylon Rivet - 1/4 inch H#881216 (Lowes) barcode 0823671607, for the top of dash