I have for sale some extra fluted coulters and mounts larger size, not for 18" tines. Built for 21" tines. These are fluted to self sharpen and are good for Kikuyu pasture as they tend to allow the tines to work without rolling up the pasture like a big mat which can occur when you use the plain unfluted coulters. They have never been attached, but show some weathering to the external paint. They are too large for my current Yeoman's plough and need a new home so they get a useful life. Ridiculous price new, the lot for sale for $500. Paid $350 each 5 years ago. Can post pics if anyone is interested. Location: Sunshine Coast Hinterland, Western Blackall Range. Steve.