I have used
Automotive Touch Up Paint from PaintScratch - Order Pro Grade Paint - PaintScratch.com in the past and been very pleased with their products. I just used their search function for your 80 928 and they show four blues available. Two look to be in the ballpark. You can give the paint code numbers to your shop and they can match it. The light blue will look nice with your tan interior. Please post a pic after you have it finished.