OK these numbers are making more sense with David's correction. 

3 3/8"  or  85.725mm (from Karl's link)
3 1/2"  or  88.900mm (David's revision)

1 3/4"  or  44.450mm (from Karl's link)
2"       or  50.800mm (David's revision)
                

I took some measurements off the European towhitch on my Syncro and that came out to 3 1/2" on the horizontal. Just a wild guess but looking like the SA hitch has the same hole spacing as the Euro hitch.

BenT

On May 24, 2011, at 4:07 PM, David Beierl <dbeierl@attglobal.net> wrote:

> 
>> The bolts on my receiver adapter are spaced 95.5mm O.C. horizontal by 58.128 vertically on one side and 57.125 on the other.  Or in inches, 3-3/4 x 2-1/4.
> 
> No they're not, I did the arithmetic wrong.  They're 3 1/2 x 2" on centers.  What a maroon!
> 
> Yrs,
> d
>