You did not specify what "these parts" are; it depends on whether it's an English or Western saddle. Common to both are the pommel, the seat, the cantle, the stirrups, the fenders, the cinch. Western saddles are much bigger than English ones and are used for entirely different purposes. Western saddles have a horn, that's one difference, and you really need a picture to see what the differences are.
seat
There are over 20 parts to a western saddle. Which 4 do you want to know?
carriage comprises of parts-saddle and apron.
i think there is no palm rest. bty r u doing howrse?
gunpartscorp
A saddle seat is a concave seat, occaisonally with a ridge in the front, similar to that of a horse's saddle, found on a Windsor chair.
a small saddle pad made from goat or fox skin found on an iberian saddle
when it fits your horse
The saddle cloth is found in your howrses box and is automatically placed on that horse. Each howrse must fine its own saddle cloth.
Part of the saddle, possibly pedals, grips. Parts of the shifters, brake levers.
Saddle horses. that was too easy. if you are talking about the game horse isle, well, any horse that you can find in grass can be found anywhere on any isle in the grass, including saddle isle. some breeds like mules can be found in the forest, but if you want to find wild horses on saddle isle, then lok in the grass. there are tons of horses in the grass.
tree flaps girth straps