I'm going to try the Stens 362-820. The machine I'll put them on is a 22 yr. old Exmark Lazer Z with an EFI Kohler with 1040 hrs. that I bought new in 2004. It's a great machine and has been virtually trouble free.I know. The notched high lift is my personal favorite. We still don't know what mower these blades are going on.
The Stens 362-820 will be close to the Mamba blades.
Here's another
I'm currently running this blade on my Gravely.CMB-276-3 - USA Mower Blades
usamowerblades.com
Gator® G6™ Blade, 20-1/2" | Oregon Products
Heavy duty 20-1/2 inch mower blade for commercial applications. A top performing blade that withstands tough conditions. Replaces Gravely. Get product specs and part mapping info at OregonProducts.com.www.oregonproducts.com