Need a clutch inspection cover

[mogulmasher]

I got a new to me '77 K20 the other day and the sheetmetal clutch inspection cover on the lower part of the bellhousing is missing. Can you still get these from GM? Maybe I could find one in salvage yard, but these trucks are scarce here.

What years/trucks will be the same? Assuming all years with sm465 will work.

 

[jones]

I yahoo searched factory replacement+externally balanced flywheel+400 sbc and it took me to some e-bay sight that had an a$$load of them for less than $20.