Perhaps just mine, but the compatibility tables for a 08 9-7x aero list a lm487 flasher. (and said to be used on TBSS) I ordered one as I installed TRS XB 3157As in the front turns and was getting hyper flash and did not want ballast resistors. Once the lm487 arrived it was obvious it was incorrect. Mine uses a gm 25746427 common to Savana vans. After a bit of searching and cross referencing, a lm502 (Novita) crosses over - and works - no hyperflash.