The treatment with a cardinals differes between the groups:
In the first type, we use "a pair of" So we say "three pairs of binoculars". It is considered an error by some to say "three binoculars", however this usage is not uncommon when speaking quickly and casually.
"Clothes" and "clergy" can also be used ...
Both are acceptable, though I prefer the first version with the plural.
The second could be read as "there is exactly one record page where this extension works". I don't think anybody would actually think that, but the general form "record pages" seems to work better.