@DWS1104 Nice, nice Packard. Have you been in touch with Dave Czir(sp)? Who maintains the Packard Club website or posted on Packard info.com? Dave has a 34 I believe 1104 sedan to call him an expert is an understatement. I can't imagine this info isn't available through either of those sources.
Alternatively you might do what I did with my aftermarket cannister type filter - take the old one off, drain as much as possible bag it and bring to a parts store on a slow day. A good counter guy will work with you on it.