A:AnswerIt appears that your civic has 6.5 front and 6x9 rear speakers so these JBL speakers should fit but I'd recommend JL speakers for better sound quality.
A:AnswerBolt pattern is pretty standard, if you have a factory proprietary mount like in the Toyota JBL systems then you can order an adapter cheap or cut out the old speaker cone and make it into a bracket if you have some basic fab skills
