I have an old spring tine harrow that is 6' wide with 2 rows of sweeps. I removed rear row of sweeps because too much plant debris was getting caught between them. The sweeps I have now are double ended reversible chisel points, about 2-3 inches wide by maybe 9 inches long. They dig well but tend to go deeper than necessary, bringing up too many rocks that are 6-8 inches deep. I've seen replacement sweeps for those harrows that are more triangular and much wider than mine. I think those would not tend to penetrate as deeply and would turn over more of the surface several inches of dirt. That would suit me fine. Just not sure where I saw them to try to order right sizes. Any thoughts??