Does the frog or bowl have an extra set of holes in it? Or the cutting should have two rows of holes?, you just take the bolts out and lower the edge.
The 4T6626 is the current number for the 8C 70 (stinger arrangement)
Length 55.38"
Width 13"
Thickness 0.88"
1-row, 16 holes (off center)
What I do not understand is that the existing edge is curved about 1 inch. Not top to bottom but side to side. The new edge is straight.
If the bolt pattern matches for the straight cutting edge you may have to cut it in half to fit the curve surface. Not sure if a large power hack saw, band saw would cut it, or else a matabo.