1.5" Delrin Rear Lift Coil Spring Spacers Fits (1987-1999) Pontiac Bonneville. Delrin is an engineereed thermo high density polyurethane  used in precision parts requiring high stiffness, low friction, and excellent dimensional stability. It will not rust, corrode, crack, or break. Therefore, you can have complete confidence that our parts will last for the long haul. Installation instructions available upon request.  We make everything we sell here in the USA. We make custom suspension parts.  Buy With Confidence: We proudly manufacture all of our parts in Southern California and we offer a Lifetime Warranty on everything. Shipping: We ship promptly (usually same day or next day) using USPS Priority Mail. Payment: We ask that you make payment within 7 days of purchase. Otherwise, Ebay will automatically open a case as this is there policy. Returns: We accept returns. Please let us know why you are returning, so we can do better.  We appreciate your business and look forward to giving you a great shopping experience!