Pat,
The current Burns Marvin arm would probably be as close as damn is to swearing to the original on the Vista Sonic ( a bit shorter though), on the other hand the ones that come with the present issue Burns Mk 9 add on trem units would do the job as well, there was a few of them new on EBay recently but I can't find any at present. If you go to Alfon's page at
http://www.burns-guitars.nl/index.html you may find he has some for sale,
Here's a few pics (the Vista -Sonic from Alfon's website) that may be of interest. Hope that helps!
