We had these OE Spec Leaf Springs manufactured for us in Sheffield England, they are manufactured to the original specifications with the two bottom leafs measuring 1/4" thickness and the top leafs measuring 3/8". They come with spring eye bushes fitted. Yes they are more expensive than the Repro ones available from other suppliers, but they are worth every penny. Will fit all MK4 and 1500 Spitfires. Note: remember to replace the spring pad Pt. No. 149191 when replacing the spring. UPS additional shipping $10