Seeking Head stud socket for 1.5l Yaris engine - supplier?

[JanP]

Hi all - had car towed after massive puddle killed the motor. Trying to obtain a head stud socket for 1.5l Yaris engine. Have tried Torx bits and M8, M9, M10. None fit. Located in Perth. Hoping someone will know what and where I can obtain or even borrow one of these. Cars in pieces in garage - motor out but can't pull it apart like I need to without this I gather.

Is a 2007 model YRS.

thanks in advance

[Hiro]

Have you got a photo of the stud?  There are a couple of styles which look similar to each other but aren't technically cross-compatible, like triple-square and 12-point/double-hex.  Since you've already tried triple-square/XZN (the M8/9/10 bits you mentioned) I'd say it's a double-hex