Seat raisers
Can you put bushings under it? It's more technical than, say, phone books

but my only concern is safety. How much stronger should you make the bolts if you move the seat up an inch? Do you *have* to get more sturdy bolts? The hardware store should have aluminum bushings that will fit over the bolts that hold down the seat. Like really long washers.
I don't know about safety but I never sit in the passenger's seat so I don't care about that seat very much

I don't have kids so the backseat will never have me in it. I am not sure I could care any less about comfort in any seat but mine. It makes me laugh about the passenger looking like a kid, b/c they are so low! Makes them feel like they are in a bigger car?