Ah ok I see, so I should look for something like "BOM furry kit" on the marketplace?
If so, any well known established brands you could recommend?
"Bom" and "Mod" will work but it's too broad. Some people use the the word "kit" but you might miss out on a few listing cause they don't alawys mention that word
your better off looking for the type of creature you want... (Fox, Lion, Monkey, Dog, deer, dragon,shark,bunny, Squirrel, Doberman,Husky, Dalmation, lepoard... etc ) from there you can look at it's listing and it will tell you which heads or tails you need to work with that mod....
another option is to find the head kit.. and from there find all the kits that work with that head... alot of furrys mix and match.. you don't have to use the same ears and tail... but all kits are usually based off the head so type that into search instead.
Example:
i looked up "husky" and in the listing it tells me in the details it's BOM what and head and body parts it uses and includes links to the marketplace to buy it so you can use the mod.. the better listings will tell you everything you need or what bodies it was tested on.
I already owned a head called" Foxcat" from a store named "Happypaw" or "HP" i type it into the the marketplace and a few pages will show up based on listings that mention foxcat or happypaw..
Do be aware There are still some applier based avies on the marketplace. the listing usually makes you aware if it's applier or BOM based so make sure you read the details before buying...some times the appliers are only for the head.
There is an event called abnormality that comes by every few months. features everything from sharks to aliens. i definitely recomend you check out thier new one come may.
A shopping event for Abnormals
abnormality.is
AUGUST is probably a good place to start: they have some good headmods and base sets Espen head is popular for people wanting a dog look
Happy Paw has alot of popular head as well. foxcat is probably the most well known.
i could throw more at you but i'm at work