I recall that the lower pan on my '51 has slots on the rear bolts also. Makes it easier to install, with the bolts started in place, then slip the pan in place and install he other two bolts.
Hopefully I can avoid the electric chair. grin


Kevin
1951 Chevy 3100 work truck
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1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car)
Busting rust since the mid-60's
If you're smart enough to take it apart, you darn well better be smart enough to put it back together.