Does anyone know where I can get a 67 Splitty blinker arm?

Search for semaphores

http://www.ebay.com.au/sch/Car-Truck-Parts-/6030/i.html?_from=R40&_nkw=se...

theres one on ebay don't know if its a 67 but looks good.

http://www.ebay.com.au/itm/Volkswagen-Kombi-Indicator-Switch-Splitty-/2315862...

You can buy them new from local and overseas suppliers.
https://www.wolfsburgwest.com/cart/DetailsList.cfm?ID=211953513E 
http://www.justkampers.com.au/vw-t2-split-screen-parts/t2-split-electrical-pa...
http://dasrestoparts.com.au/electrical/bus-splitscreen-electrical/gauges-swit...
Note, unlike US splits Aussie built 67 splits did not come with the high/low beam switch on the indicator.

I have one of these as new
http://www.justkampers.com.au/vw-t2-split-screen-parts/t2-split-electrical-pa...

Done 500 klms yours for $100 posted?
Mitchell