I found this on Slickdeals this morning. Be sure and follow the instructions. I looked up one for a 1990 Suburban. The K&N number is E-1500. I then went to Amazon and entered E1500. Remember to remove the "-". Amazon has K&N Reusable Car Air Filters for ~$27 w/ free shipping. They also have oil filters for ~$6. Prices are about $15-$25 cheaper then Kragen. Go to the KNFilters.com. Enter your car info and it will list part numbers for your car. Remove the dash (-) from the part number and search for it on Amazon.