Roy will have to drill screw holes for the 6.5". You need these for the dash Jeep Wrangler (Tj, Rubicon, Unlimited) Front Dash Speaker Adapter 1997-2006. Converts 4 By 6 Inch Factory Speakers to 5.25 Inch Aftermarket Speakers (4x6" to 5.25"). http://amzn.com/B007ZDCGVG
And you have to cut a little/trim metal behind the dash. I used a Dremel tool. Mine is a 2000. Sounds like you don't want to do any of this but you want the speakers. I guess you have to weigh what you want more. Some one drilled holes for the 5.25's already was in the factory but oh well. 6.5 will cover them. Point being don't be afraid to modify.
Edit lmao auto correct started this off changing you to Roy. It made me laugh. I'm leaving it.