ok i've tried searching for this, so if someone actually has a link to this please share.

what is the size of the hex bolt that actually holds the rear belt spindle in at the top by the speakers and at the bottom of the floor board? i've found the sizes for the bracket that holds the belt, but i can't find anything for the actual belt

 

It's a T45

 

much appreciated. are these hard as hell to remove on all our cars or is mine stubborn?