If you're asking about the condenser for a Model A distributor that's been converted to modern points then the Napa part is the Echlin FA82. There have been modern distributors (Toyota maybe?) that have been converted to fit a Model A but I only know they exist, nothing else.
I prefer to use a modern points and condenser set from a brand of performance distributors that we ran in Ford small block V-8 racing engines back in the mid 1970's. They are not inexpensive but we never had ignition problems.
There have been several types of modern upper plates available over the years so I usually ask folks whether the condenser attaches with a screw that has a fixed bracket on the side of the condenser or whether the condenser has a clip that holds it with no attached bracket on the condenser. I think the NAPA FA82 has a fixed bracket. They also have the older Ford FA66 and FA76 that will fit into a clip on the plate. These are Echlin types and both will work with most 1.5-Ohm coils used from 1949 on up into the 60s and is some cases the early 70s.
Condensers for these types of plates are available from the regular A-bone supply sources and likely from many other auto parts sources for the older Ford vehicles that came with a points type distributor. Looking at the NAPA fit guides, the ones I listed fit most of them unless the length of the condenser/capacitor container is too long. Reliability of some brands is questionable but none of them are as reliable as they were back in the day. I purchase two or three just to insure that I will have at least one that works.
I'm afraid 99.9% or the counter people at any parts store would look at you like deer in the headlights if you hand them a condenser unless you fully charge it first. Most have no part number on them and counter folks don't do well with out a vehicle to match it to or a part number.
Echlin was purchased by Standard Motor Parts a while back and I've already noticed that they are intermixing parts between the two names. I figured that would happen but there is nothing that can be done about it.