What size torx for NBS front seat remove???

I know you have to get a special reverse torx to remove the bolts for this but what size?????

iwas racking my brain with this a couple weeks ago,then i tried some regular sockets and it works!lol

lol i've removed my seats a number of times and never even noticed it wasnt just a regular bolt. I've always just used regular sockets.

i have mine out right now

the front bolts i used a 7/16's deep well. and the rear i used a 15mm