i am looking for a set of shackle bushings for a 99 blazer.

partsource does not have them nor can they get them.

same story with GM dealers.

 

You may need to go aftermarket with someone like Energy Suspension. You probably want the polyurethane bushings anyway. Try Albion Auto Parts Brittania and Dixie (905) 670-2969. If they don't have it they will try and get it.

 

have a look here
ISB335 - Spring / Shackle Bushing - Ingalls Engineering Co., Inc.