1968 Z28 smog pump assembly

[ZLP955]

I need a 234 pulley and a 3/4" thick steel spacer for my LT1 Corvette.
The 234 Pulley is the Small Block Corvette Pulley.

I have a 234 pulley, wondered what the application was - especially the year(s) of use, because it has no 2-letter suffix like other GM pulleys of that era. So it's a C3 Corvette part?

[firstgenaddict]

234 without the AL letter code is Corvette L46, L79, LT1  68-72.
I am looking for one  with original finish(phosphate) if anyone has one. 

[z28z11]

My '74 parts book does not list Vette or truck parts: here's the one passenger listing for the 234 pulley. Vettes may have carried other applications, my guess as to what my particular pump and pulley came on (and spacer) is based on the spacer listing. Notice no "AL" suffix on the pulley -

Regards,
Steve