I was taught that the correct use of the plural form went with the context of the usage. If the word was being used in its original context, then the original plural should be used, but when transferred into a different context, then the appropriate plural should be applied.

So internet forums are not Roman fora, and modern tonneau covers do not cover barrels :-)

Tim H.
1986 4/4 VVTi Sport, 2002 LR Defender, 2022 Mini Cooper SE