I agree with the Koni guys, why would you want to use inferior product on your car just to "look" authentic.
Fact of the matter is that even if your car was totally original, you would've replaced the shocks by now anyways.....so there goes authenticity out the window (just my humble opinion). I have used Koni's for years on just about every car I have had and have never had a problem with them. Everything from Mustangs to Volkwagens and more...they are truly a great product!
I currently have Koni Sports (Yellow's) on my SVT, and Koni classic's (Red's)on my GT6. Both are adjustable to the type of ride you want firm, softer etc, or where you want to drive, track, street etc. Yellows are adjustable by a konb that you fit on the top of the strut and simply turn, but the reds are much harder and I think you need to remove them from the mount to turn them. To be honest I haven't adjusted them on my GT6 though because as soon I as put them on, I started my frame off, and haven't finished it yet.
I think you can only get Red (Classic's) for our cars though.
I guess all I am saying is that technology has come such a long way in the 40 or so years our cars have been around, why not take advantage of it?
Just my two cents (even though it's Canadian and only worth .78)
Mikey