As an owner of several Merkur XR4Ti's it's the same story, so I learned long ago to use the other cars sharing the same drivetrain (Mustang SVO and Thunderbird Turbo Coupe) for counter parts reference.

When I need something from a counter for the VX I'll typically reference a 2000 Trooper. That way they seem to always have the part.

Good score on the filters! I've just gotten in the habit of ordering several filters and PCV valves at a time from AutoZone's web site as they never charge shipping and it's nearly impossible to get someone to ring you up at the actual store.