If it's the -181 archer you are looking at, the external shap e is identical to the -161 Warrior II. Those are readily found at most GA airfields, and the odds are that if you phone in advance and ask, nobody will mind you going and measuring one up.
One warning however - most clubs operating off grass probably removed them long ago as a nuisance. So either you want to see if they have some buried in a cupboard in the back of a hangar, or a flying club with all hard runways and maneuvering surfaces.
G