As far as trunk pan patches they are available. Yout can buy the pan, the extensions and the ends. The 67 and 68's are the same. But there are full trunk pants that for from the tail pan all the way to the the rear seat. The 68 pan is not currently available. The 69 and 67 are. But the 67 does not have the staggered shocks. That is the only difference. If you wanted the full pant you would have to order a new shock tower and modify the pan.
Also Ricks First Generation sells everything you need. Ive dealt with them ALOT with my 69. Never give me any problems and they know ALOT about the cars.
www.firstgen.com
Also so does Classic Industries.