Which 870 Mag Tube Spring? 870P/Wilson

[AO520]

Hi everyone... I just wanted to see what someone else would do in my situation. I have an 870P with a S&J follower. I just bought a Wilson Combat +1 extension which comes with their follower and extra strength spring. I haven't checked, but i've heard the 870P comes with an extra strength spring from the factory.

Should I just install the extension and keep the Wilson spring as a spare?

or

Should I replace the spring and sell the factory one?

Also should I use the Wilson follower or sell it?

Thanks

[AO520]

I got the Wilson +1 mag tube extension in today so i figured I'd share what I found. Sorry for the blurry pics...

The 870P factory spring was about 2 inches shorter then the Wilson spring so I switched them out and will probably sell it.
http://i1221.photobucket.com/albums/dd465/Adam_Oseran/2fd45c357f85ff99ee8857b5fff2cb0b.jpg

The S&J and Wilson followers are similiar. As you can see from the 2nd pic the S&J is a little shorter. I've read that some people have a hard time fitting the last shell in sometimes so I figured the S&J would be better.
http://i1221.photobucket.com/albums/dd465/Adam_Oseran/196c8a4922b3bc76b396858a6c86eb73.jpg

http://i1221.photobucket.com/albums/dd465/Adam_Oseran/7e38a73d5d793d04569e120986f636fe.jpg