'73 KG wiper arms

Can anyone help with info on wiper arms for a '73 Karmann Ghia cabriolet?
I have a pile of old arms here and most are different. I had no idea there were so many variations.
I did get one that looks like it would go close. It is 270 mm long overall with the U shaped end and a slight bend at the end.
The wiper head is 10.5 inches long and seems too small. I think a longer head (about 13 inches?) looks like it would work.

I tried KGPR and CIP who both list a lot of different arms that are very model specific, but nothing for this year.

Can anyone shed any light on this?
Thanks,
Phil.

Here are some shots of my 72 cabrio. I am not sure if they are the same but I would expect so.

These are the right hand side.

Yogie

Here is one from the left side. It is slightly less curved.

Yogie

Thanks for the 3000 words yogi. Good effort!
They are shorter than I expected.
About 230 mm from centre to end. I have a few of those.
Wiper head looks to be 300mm (12 inches).
Sorted!

I thought the tape would be useful and these are the original arms as well.

Good luck.

Yogie

Try these places, one of them will be able to advise you which is the correct one's.
http://karmannghia.com/
http://www.house-of-ghia.com/shop/
always been able to get what ever i want for my ghia.

Do you mean this part

73 Wiper arm