The parts of a toilets are sold separately.
I use model numbers for the complete toilet.
For example, a CST744S Drake two piece toilet would consist of a C744S bowl and a ST743S tank.
The print outs of my invoices always show what pieces the model consists of.
The main difference between the SS114 and the SS154 seat are the style, that and price. The book price on the SS154 is more.
There is also the SS204 seat that is similar in price to the SS154.
I don't ship in Texas. I used to sell some from Houston, but that hasn't been much of a source for me lately.
www.totousa.com
has a dealer locator on their web site.
I quit shipping years ago, I was one of the first shippers of Toto until the truck drivers convinced it wasn't worth it.
Every once in a while a mail order customer will try to get me to replace some other retailers broken shipments. They pretty much tell you they have a broken toilet to return, not in so many words, and can you come out with a good one so they can trade you for a broken one.
They don't say it that way, but you begin to get a feel for what what is going to happen based on their line of questioning.