The Ill is from the FORD Master Parts Catalog for the period.
There is more than one service part on the assembly.
Where to find? Maybe start here -
http://www.vanpeltsales.com/
Maybe a PARTS WANTED AD? It should be out there in someone's drawer or box.
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- WHY IS IT ... 
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... that everything you buy in the grocery store is either wrapped in or contained in plastic but the government doesn't want you to carry it out in a plastic bag?
WONDERING IN W(BY GOD)V ...
DIAGNOSED CDO - (OCD In Correct Alphabetical Order)