1832 Lone Star Rd, Mansfield, TX 76063. 100% Genuine, Authentic Firestone Air Bags from Firestone Dealer. (2) Brand New UN-used Firestone 6781 Ride-Rite Replacement Helper Air Spring with 1/4 NPT Port. These suspension air bags are a direct replacement for most Firestone Ride Rite Kits. This Air Spring is style 267C 1.5. 100% Genuine / Authentic Firestone brand Air Springs. All NPT (National Pipe Threads) will measure bigger with linear tape measure. Picture for the (NPT) National Pipe Thread Reference chart. This bag will take 2400 LBS of load (each bag). Please check the sticker for the last 4 digit Number at bottom of your Ride-Rite bag to match with (last 4 digits 6781). If there is no sticker at the bottom of the air bag then measure the top studs from center to center on your bag, if the top two studs are. Apart then this may be your replacement bag. OR check Firestone Ride Rite website application guide to cross reference the replacement bag part number. Capacity – 2400 LBS (each bag). 1/4 NPT Single Port. Compressed height : 2.8. Extended Height : 8.5. Ride Height : 5.5″ – 6.5″. Max Diameter : 6.6. Top Studs : 1.75″ (1 3/4″) Apart Center to Center 3/8-16 UNC. Bottom Blind Hole : In center with 3/8-16 UNC. This product can expose you to chemicals including lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, go to.