I want to build a IRS locost using Sierra parts. However, I don't want the avon setup, and not the dion setup. I want to use wishbones (for example like westfield).
Does anyone have some drawings for a sierra based IRS using wishbones?

hmmm deja vu....

Check post IRS AGAIN!!! and you'll see that these figures are not as easy to come by as you'd expect. If I get a working setup details, I'll advise you but there are a few different setups out there so getting one that is just right may take some time. You may find a search (top left) may come up with enough to start you off.