there isnt really enough left of them to get an accurate thickness measurement.
the OEM numbers i posted were found in a scanned manual somewhere on the net, and that is where i found the cutting tip lengths. that's about all i have to go on.
Ive had the same problem with my chief also .I gave up looking for replacement blades long ago.
No one makes an exact fit So what Ive been doing is cutting down my used Scag blades with a plasma cutter then using the grinding wheel to get the edge back . cant see spending money for brand new blades that I would have to cut down to make make work , The scag blades have served their purpose and do a good job as replacements for the chief .