Source for Swift DB4 Technical drawings?

[Jamez]

Is there a source for Swift DB4 technical drawings, specifically for suspension/chassis support parts?

I am part way though a nut and bolt rebuild on my Swift DB4 and I have found some suspension support plates that need to be reproduced. I would like to replace it with a square part but as you can see from the attached image it's cracked at the top of the 1" holes for the ARB and has bent inwards at the bottom.

I am fine with designing a replacement to fit but it would be nice to know what it should be.

Bonus question, are the four AN3 holes that bolt this support structure to the inside of the tub a non standard modification? The alloy it bolts to certainly looks looks home garage made.