Skill comes w/time you'll learn that. probably not gonna find two many that just bolt right up, but with some patience you'll be able to make almost any seat work. just remember NEVER just drill holes threw the floor boards and bolt new seats in.
By early 90's you mean 92 and before. never really paid attention I thought they didnt change seating until the 96 body style! Boy was I wrong they changed everything in 93!! So the 95 buckets I got at the junkyard they looked to be a pretty good fit but once I got them home no such thing as a pretty good fit more like I got to make up some shit to get them in. But they are comfy as hell!!! way more comfy than my integra seats!