There are two standard heights of radiator fill necks that will cover probably 90% of every American made vehicle for about 50 years. Is there any reason someone can't use a tape measure or a ruler, measure the inside depth of the neck, go to the FLAPS, and do some measuring of the caps they have in stock? "This ain't rocket surgery!"- - - - -or maybe I'm having a Mr. Spock moment- - - -"That is not logical!" Getting OCD about specific part numbers doesn't make the cut in the real world of auto repair.
Jerry
In the interest of saving time and frustration at this parts store counter, I try to do their thinking for them before I even walk in the door. There is exactly one parts store in my town that’s capable of doing the simple task of measuring and referencing and they keep the shortest hours of any. Measuring caps in stock at this O’Reilly is a fine idea, but strangely they don’t keep 4 lb caps in stock.
I wrongly assumed that a 4 lb cap was a 4 lb cap without even thinking about fill neck depth.
I’m not the least bit picky about part brand or even part number. Was just hoping to find something (from someone here) that is already known to work so I can walk in, make my exchange, and walk out. I’m being lazy, basically.