I don't know if anybody sells heavy duty sills for series Landies off the shelf especially for 109s. I very rarely see anybody else out greenlaning in their series Land Rover these days (why not?), so I don't suppose there is much of a market for them. Perhaps some 110 sills could be adapted without too much trouble. I've been meaning to make some for my 88" for years but never got round to it. I think I'll be making a guard to protect the gearbox X member first anyway, because I've already ****ted mine on a tree stump and bent it back 2 inches (It was a new chassis - boo hoo!)