Finally found an relatively inexpensive solution to the problem of the centre armrest being too low. Found on ebay $20 usd with free shipping. Comes in a couple colour variations. The fit and quality is quite good. A few centimetres longer than the stock one, otherwise a perfect.
Sports Line Armrest Cushion Black FOR Subaru Impreza Legacy Tribeca Outback | eBay
Sports Line Armrest Cushion RED FOR Subaru Impreza Legacy Tribeca Outback | eBay
Pic installed in my car:




Sports Line Armrest Cushion Black FOR Subaru Impreza Legacy Tribeca Outback | eBay
Sports Line Armrest Cushion RED FOR Subaru Impreza Legacy Tribeca Outback | eBay
Pic installed in my car:
