Wiper arms for a RHD GT4.

I have different wiper arms,(size and brand) (silver)on my 1979 308GT4,I dont know which one is correct for the car.Can anyone advise as to where I can get hold of the correct ones?I believe the correct ones have a cover(boss)where they connect to the splined shaft and they are silver or stainless steel.
Thanks Geoff

 

Thanks Tom,I have spoken to Superformance and they have advised that the arms they have, fix to the GT4 with an exposed locking nut.Possibly aftermarket manufacture.The correct arms have a pivoting cover over the locking nut on the splined shaft!Every pic I have of a GT4 shows the pivoting cover whether black or stainless finish!
Geoff

 

Thats the "correct" ones Mark,I have double checked with Superformance and they are NLA.
Thanks Geoff

 

Thanks Barry I will check.
Mark would you be good enough to post a pic of both wiper arms???
Thanks Geoff

 

If you can post a pic I can tell which of my wiper arms is correct!!!

 

Much obliged Mark,they appear to be quite narrow across but uniform,with mine they are broader across and the RH one has a dog leg!
Thats a big help,now I know what to look for!
Regards Geoff,the car sure looks nice in silver,chuckle!

 

Thanks for the tips,I will try but......
Geoff

 

Thanks Mark,very nice of you,I found them at Eurospares for much the same, double ouch!