vauxhall combo disk reeplacement

[sys013]

I have an 03 1.7 turbo diesel combo and I want to replace the front disks. I had a look at what has to be done and found the caliper mounting bracket is held by some kind of splined nut. I believe from the web this may be a XZN nut (similar to a spline or torx?). I need to buy a socked to undo this but don't know what size or type to buy. Any help much appreciated.

 

[stuartturbo]

not sure of the size but if you intend to do more
just buy a rail thats what did years agomk2 astra days only needed 1 for the head bolts

http://www.ebay.co.uk/itm/14PC-CHRO...t=UK_Hand_Tools_Equipment&hash=item58a5c923f4

 

[stuartturbo]

or even better for a VX
http://www.ebay.co.uk/itm/Torx-Sock...t=UK_Hand_Tools_Equipment&hash=item258291e89d