Bernie, the 488296 should be the long nosed version, which was used from 1969-up. Just to be sure, you can measure that pump when you take the pulley off. As stated above, it's either 4" deep or 4.5" deep, and yours appears to be the far more common 4.5" deep.
You'll need the 2-5/8" deep double pulley, which is also fairly common, and of course a new belt.
Probably search on E-Bay, or use the link provided above to the PY section.
