What companies make seats for our cars? I'm sure they're out there. Are there universal seats or are all car seats specifically made for certain cars?

I think the seats are pretty much universal but the hard part is to get the sliders that fit the seat and fit the same bolt pattern for the Celica.

C-one make a seat and slider that goes straight into the 6th Gen but you dont want to know the price and shipping. I think you might have to get someone to do some cutting and welding but im not the one you should be talking to about seats cuz I have stock ones and they suck.

Corbeau also makes sliders and brackets to fit their seats. Probably one of the cheaper seats without sacrificing quality.

do the sliders and brackets fit into the 6th Gen?

Ive seen racing seats on Ebay that claim they will send you the brackets that will fit your car. Might want to look into it.

Racing seats are universal, you just have to get the right brackets for your car or have custom ones made.

I'm sorry, my post made no sense. Corbeau makes seats with brackets and sliders to fit OUR cars. Seats will run you about $600/pair and brackets/sliders are about $70/each.