I've ordered the Armster 2 so will post a photo when fitted. There was a 500x console on eBay complete with Armrest but it appeared to have no back panel and I did not fancy stripping the old one out to find there may be bits missing...
Enclosed I hope are 3 photos from my install of the Armster2 Armrest.
You screw the armrest to the base unit which then fits over the centre console bit at the back between the seat. You mark 4 holes, drill and screw in 4 self tappers.
The Armrest looks good, to OEM quality but the base unit which fits over the centre console is hard scratchy type plastic and not as good as the OEM scratchy bits in the Fiat!(Never thought I'd say Fiat trim was good quality!).
Also the 4 self tappers look a bit naff, (photos show them) given Fiat go to the trouble of enclosing screws and bolts inside little flaps, Armster could have done the same, would have cost pence more.
One final gripe(!) is although I ordered from Armster UK, it was clear they then ordered from Armster Europe and the box came from Hungary and took 10 days from initial order.
This is the deluxe armrest, although there is a cheaper one at £50ish, this has 3 height positions, a slide forward cushion, pen and coin holder and a rather naff clip-on purse you can detach and carry about on your belt....