help needed to find a part of an Skywatcher AZ3 mount

[Oscarw]

good evening all, 

i really need help.  

I have an old Skywatcher AZ3 mount with a missing part. It's a part of the Azimuth locking mechanism,  it the small metal square bar in the bottom right of the attached picture. 

if anyone knows the dimensions and material of the bar i could make one myself. 

[TerraC]

Just seen this..  Do you need the whole head or just the bar?  I was about to throw a broken one away.    One of the sections with the scope rings snapped off in transit so I replaced the whole head with an AZ-GTI.