[Scuderia_Turini]

Perhaps the front tyres are too large? 
I am away from home for the weekend now so can't measure one of my standard cars
The lower body section just pulls off - best to lever it gently with a thin blade.

Yes the steering unit just pops out, again, lever it gently.

Now you have the C82, you will want  a C81, so have sent 4 ferrules.  I started with the C81 and then another and then a C82, and then ...  ... well , they are nice. 

Leo