Here is as close a fit as I could get to the original, no-longer-available Saab Viggen part #5124441. Just updated today (06262017), should fit even more snugly now!
This is the Tow Hook Cover
for the front bumper. Should fit all Viggens!
(also added a little vintage SAAB flavor to the backside)
The material is strong, flexible, and quite comparable to the original plastic parts. The colors referred to as 'polished' are less rough than unpolished, but please do not expect a glossy finish. In automotive terms, this finish would be considered matte or satin.
Should complete your Viggen quite nicely with light sanding and just a bit of paint!