I've had good luck finding them at
this website, though you'll have to check both the rockwell and delta pages. Look for publication reprints, and when you get to the manufacturer's page, click on the Pub. type heading to sort the column into jointers, table saws, etc. You may be able to find something of comparable age that will have descriptions to help you, as many models had relatively slight variations from one another. I'm not sure what vintage that is, but there are general line catalogs and instruction manuals listed in
the Delta pages that go back many years. Some of them will have basic jointer instructions that may directly pertain to your model. Also check that model number carefully. I've not seen letters in their model numbers before. Usually it is two, followed by three digits. Compare
this link for an indication of what you could be missing.
I hope this information allows you to resolve this issue. If you need further assistance, please post back with a comment to this thread.
If I've managed to answer your question or solve a problem, please take just a moment to rate this post....thanks!