Not fancy poly bushing inserts, just stock OEM replacements. (complete bushings)
The uppers were easy to find because they are the same as the Chrysler valiant (dodge dart)
And inexpensive too! I picked up a complete set of 4 for ~ £10 total.
But the lowers seem to be made of "unobtainium"!
I figured that since they were the same as the Sunbeam tiger, they would be easy to find, but so far, I have been wrong.
Here is what it looks like removed from the arm.