OE Number: The referencing OE number of this engine stand adapter plate is 551897, which is molded and designed depend on the original data. Fitment: The engine safe stand adapter plate is a replacement for LS1 BBC SBC LS Duramax Engine, please check the model before ordering. Anti Impact: Heavy duty 1/2in thickened plate and all bell shell enhance engine mount clamping strength and avoid engine drop damage. Complete Kit: The package includes screws, nuts, support columns that can firmly hold the engine to prevent vibration and reduce engine wear. Easy to Install: Stringently manufactured to meet the original standard, perfect replacement for the old or broken one, improving the time efficiency. Replacement for Duramax SBC BBC LS and LT series engines. Fits for LS1 LS2 LS3 LS6 LS7 LM7 L33 LFA LSA LS9 LH6 LQ4 LQ9 L76 L92 L99 L96 LC9 LY6 LMG LH8 4.8 5.0 5.3 5.7 6.0 6.2 7.0 L 283 302 305 327 350 383 400 427 454 6.6 L. 7 x Support Rod. Please double check the part number of your item, matching information is for reference only. If using a 1 ton engine stand the backing plate is thicker and requires 4pcs, 2in length (1/2-13 thread), instead of the 1.5in included. We will reply your message within 48 hours. If you do not receive our reply within 48 hours, pls. Post a message again because sometimes our message system may block some emails. If you are satisfied with our service, pls. Our aim is to provide Level Customer Service, your recognition will encourage us greatly and serve you better. We strive to keep all our customers satisfy. We will do our up most to exceed your expectations in customer service, communication and dispatching of your orders.