I think they are the same 66-68 Kevin. The big block gets the narrow spacer, small block gets the wide one.
Whats nice is the spacer bolts to the rad support, and it has nuts in place to attach the rad. I should tell you that the spacer has 2 small holes drilled either side. Was to mount the trans cooler.
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65 Laurentian post, 67 Grande Parisienne 4 door HT.