Hi Bud,  According to my 2000 Autolite catalog, they don't offer a suppressor plug (18mm) for Y-blocks.  They list suppressor plugs in 14mm size for various other vehicles.  I also checked my 2001 Motorcraft catalog, they don't specify a suppressor plug as far as I can tell.  The non-resistor equivalent to the Autolite #45 is their #35.  They do list a racing plug, #AR33 which is colder than the #35.  Don't know if this answers your question- good luck!  Nick Brann, K.C., MO

What is the number for an Autolite #45 in a suppressor plug?   

Bud in Northern Arizona on route 66 in Winslow (standin' on the corner)

If you're American, buy American

631/2 Galaxie 500XL 406   55 T-Bird