chow do i change husqvarna mower starter

[yardhubby]

Is Torx a brand or style of bit? Here is a photograph of the bolt and one of the bit I have been using. I could not get a a better photo of the bit.

 

[yardhubby]

I want to think everyone for their help. I purchased a Torx bit with the 3/8" drive. A short extender was attached but agin it would not move. I then hit the ratchet wrench with a rubber hammer and BINGO, the bolts loosened. I now have it off and can do my repairs. I am not sure I could have done it without ya'll.