Specifications: TypeOxygen Sensor Length (Sensor to Lead)500mm400mm Interchange Part Number:234-4331: Up Stream,234-4294: Down StreamFitment for: 2007 Buick Rainier L6-256ci 4.2L 2008-2012 Chevrolet Colorado L4-178ci 2.9L/L5-223ci 3.7L 2007 Chevrolet Colorado L4-2921cc 2.9L/L5-3654cc 3.7L 2007-2012 GMC Canyon L4-178ci 2.9L/L5-223ci 3.7L 2007-2012 GMC Envoy L6-256ci 4.2L 2007-2010 Hummer H3 L5-3654cc 3.7L 2007-2010 Hummer H3T L5-3654cc 3.7L 2007-2008 Isuzu Ascender L6-256ci 4.2L 2007-2008 Isuzu I-290 L4-2921cc 2.9L 2007-2008 Isuzu I-370 L5-3654cc 3.7L 2007-2009 SAAB 9-7x L6-256ci 4.2LNote :Before buying, please check the note, color, position, year make model. Please make sure to match the exact part numbers between this part and the part that you are replacing. Contact your mechanics, or send us a message to make sure it matches exactly in case of doubt before purchasing. If one does not match, please do not buy it.Package Includes: 2 pcs Oxygen Sensor Return Policy All of our items come with a 30-day free return policy. If you need to return, please contact us, let us know the detailed problem and send us some pictures for confirmation. We reserve the right to refuse any returns for objective reasons. Shipping Policy All of our items are shipped free with tracking numbers. Orders will be shipped within 3 working days upon receipt of payment. Most orders will be shipped within 1 working day. In most cases, shipping takes 8-12 working days.