The size of headtubes, forks or bars are usually the same site so they are very likely to fit.
yes except for nitros
If the 71 is a standard then yes it will fit.
yes
no.
Yes, all handlebars have the same diameter out by the grips.
if it is out of a super beetle you could have some problems. if not though, it should fit
Bolt in swap.
No. The door strikers changed in 67.
yes it will
yes
VW Bug is almost an exact fit
No, deck lids for 67 bugs fit 67's only. It has a different apron and a different shape.