If you have an Eclipse Spyder, you should definately be fine with those carseats! Even the bigger ones! I was told I may have to get a seatbelt extender for the bigger one to fit in my seat, but my seatbelt went all the way around it fine. So before you buy an extender (if you buy the bigger seat), try it out first to make your own seatbelt doesn't already do the job.
__________________ Liz  Little Lotte , Bouncer, Lilli , Yodi  |