from High Tech - not cheap, but really good looking
kits are about EUR 40 - ready built about EUR 130
Porsche 914/6 (Nr. 87037)
Porsche 914/6 GT (Nr. 87038)
Porsche 916 (Nr. 87039) - it's 914 2 33 0016
Porsche Renntransporter '61-'69 (Nr. 87604)
and finally 914 2 33 0020: