Just bought this car, dont know much about it or the history. It has a bunch of mods and apparently 400HP under the hood. Shes not the prettiest but with the exception of the little bit of rust starting around the rear wheel arch - body, floor pan, strut towers and rockers are completely rust free.
The side skirts, door panels, and rear spoiler are factory ST165. Never seen the front or rear bar covers before, they're not like any factory option I've ever seen nor from any of the more common/popular kits (Kaminari, Aeroform, SSV, etc). Possibly custom made, there was a bit of a cottage industry for fibreglass body parts for everything from Mini's to Lambo's back in the mid-90's. They do appear to only be covers though, if you don't like them, pull them off and you should find the OEM bumpers underneath.
They are made of fiberglass, the kit also came with a spoiler that the guy never got around to installing, he did mention something about TRD...I tried googling it but came up with nothing.
If they're fibreglass then they're definitely aftermarket - the genuine Toyota bits are plastic. In Aus we got a factory option side skirt and rear skirt that looked like this: I've never seen a factory option front spoiler though.