877 is a short frame tractor with 41-1/4" wheelbase.
1974-75 B-100 Auto is a medium frame with 43-1/2" wheelbase.
1976-1977 B-100 is a long frame tractor with 45-1/2" wheelbase.
If the B-100 has the period correct blade on it it should work because the rear crossbar that fits into the rear axle quick hitch has 2 possible locations in the A-frame to accommodate both the short frame and long frame models.
1974 B-100 blade model 6-2131
1975 B-100 blade model 6-2132
1976 B-100 blade model 66-42BC01
1977 B-100 blade model 76-42BC01
Look at the ipl's here
https://lookup3.toro.com/partdex/index.cfm?xCaller=Toro
Garry
1974-75 B-100 Auto is a medium frame with 43-1/2" wheelbase.
1976-1977 B-100 is a long frame tractor with 45-1/2" wheelbase.
If the B-100 has the period correct blade on it it should work because the rear crossbar that fits into the rear axle quick hitch has 2 possible locations in the A-frame to accommodate both the short frame and long frame models.
1974 B-100 blade model 6-2131
1975 B-100 blade model 6-2132
1976 B-100 blade model 66-42BC01
1977 B-100 blade model 76-42BC01
Look at the ipl's here
https://lookup3.toro.com/partdex/index.cfm?xCaller=Toro
Garry