I bought an aftermarket front valance from Automotion. It looked to be the best reproduction and they have a good reputation.
I paid about $380 when it was on sale, currently listed at $414.
It took 5 weeks to get it it since they dont actually stock this item.
Quality looks good and appears to ne a very close replica.
The mounting holes are NOT pre drilled but there are reliefs where they should be.
www.automotion.com/front-spoiler-valance...rsche-1983-1989.html
It will be a couple of weeks before I get a chance to mount it.
It does come folded on both ends to fit in the box. A coupe of hours in the sun and it poped back into the correct shape.