you cant use those wishbones for the haynes roadster, they look like locost book spec ones which are designed for cortina uprights?
if you can weld, have you looked at flat pack kits? i would recomend talon who is on ebay.
http://cgi.ebay.co.uk/haynes-roadste...item20b36b5a2e
you can also buy premade/ flat pack from saturn & 3ge