Could it be this?
http://hellfire.locostsites.co.uk/he...RSAssembly.pdf
There are wishbone designs on here as well. Measure your mounting points and compare to this plan and the one in the Haynes book and you should find the answer.
I guess my earlier post wasn't actually that helpful, I didn't know you were referring to the rear end, as a normal locost doesn't have wishbones at the back.