Set of 8 new Darton liners for Rover Block. Darton part number 480-015. I have contacted Turner Engineering in the U.K. who supply these liners. They say these liners can be used to convert 3.5 blocks to 3.9 and can be used in all other blocks but cannot be bored to.020 oversize. Set of 8 $400 U.S. plus postage. I use Paypal.