purchased a rear spoiler from poston buick & have it bolted into position. have 2 problems. 1/ the corners of the spoiler flat surface sits only 1/4" up from the quarter panels 2/ the spoiler is about 1/2 " short on the ends to match up to the quarter panels top line to give it a flush appearance, Since we are adding the GSX stripes it is important that the spoiler is flush & the quarter panels top edge meets up close to the spoilers botton line, What can be done to correct these 2 items??
If it is the same quality as the repro seal plates sold by Postons its highest and best use is occupying a trash can. Get the repro from the Parts Place. Also, I have a used oem one that I would sell for $400 but I think you would be just as happy with a correctly made made repro piece.
