Prelude Seats In a '73 Std???

I just picked up a pair of '92 Honda Prelude seats in excellant condition and would like to install them into my '69 Std. I live in Washington State and was driving my Westy in Portland at the time I bought them so I wasn't able to do any measuring of the sedan before I got them home and I found out that they seem to be a little too big to be a simple installation. Has anyone had any experience installing Prelude seats into a standard? What problems can I expect to run into? Does anyone make brackets that will allow me to install the seats without further modification? Any help will be appreciated. TIA Jerry