I believe this is correct for both years, but I only have a 68 parts book to go off of, so it's 68 for sure. Looks about as perfect as can be, includes the GM box, painted Argent. Part # 1382569, Grp. 9.740, for 3000-4000 models. "Instr. Panel Filler Plate (Argent)" Price is $100 + shipping, U.S. and Canada only, from Fargo ND. Will ship UPS in the states, and Parcel Post to Canada. Canadian buyer responsible for any fees requested upon delivery, though I hear that's more of a UPS/Fedex issue. Postal money order please, but will take Paypal if you cover the fees. Reply here first, not in an email or PM. No pictures yet, but can get some by tomorrow night if needed.
If anyone missed out on David's, I've got one for sale also: http://www.v8buick.com/showthread.php?t=171030