Package deal on all 4 ribs for ST Series plows. Genuine Meyer. Use these to build your own Moldboard, or to repair a Moldboard. Used on ALL ST Series Moldboards.The ST Series has been discontinued over 10 years now, these are collecting dust so they must go at a huge discount ($50 off!). IF you have fabrication skills and a welder, building your own NEW ST Series Moldboard is not that difficult. Everything other than these ribs can be purchased at your local steel yard. Here is an example of step by step Building a Meyer ST 7.5' Moldboard and another Building a Meyer ST-78 Moldboard Be forewarned, these come directly from Meyer with surface rust on them. Meyer has not used them in production for over 10 years, so they developed surface rust sitting around. It is normal. IF you are going to complain about surface rust, don't order them! Ribs included are highlighted in GREEN in photo.