Yes, that's correct. 1974 and 1975 are both one-year-only extensions. The 1974 units are, however, much more common than the 1975 extensions since they were sold separately (as in not as an assembly) through the parts counter.
And technically speaking, the 1970 extension with its 25-degree cut was also a one-year-only unit as the cut went to 45-ish degrees on the 1971-1973 units. What made that difficult was Pontiac kept the same part number from 1970 to 1973.
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