I have an after-market '69 TA spoiler on my '68. It looks good, as advertised, but its about a 1/2 inch too long, and a 1/2 inch too high! Pisses me off everytime I look at it!
John H, did you mount yours on a '68 to see how it would look?
'68 428 HO M3 Monster, 4-on-the-floor! Need I say more?