I have a 89 Tournament. I found pin striping and decals on EBay. They have held up fo 2 years now. The listings sometimes come and go. Look at their feedback and see if they primarily sell decals these sellers usually will list if the items are good quality 3m vinyl and if they match the original colors and font.
you would be surprised how many configs there are and that GW used over the years. if a dealer is nearby they usually sell it by the foot. you can prob match up if you need a large amount and get from a cheaper source if price is an issue.