I believe the mushrooms required for the scorpio are larger and seem to remember that Talonmotorsport on here used to sell them.
Reamer if you want to buy is from Axminster tools, just Google for website.

Reamer
 

Many thanks for your reply, can i be guided to purchase the exact reamer i need as i am afraid that i will buy the wrong one, i do not know what reamer i need to look for. (also is this reamer the same one to be used to be able to fit the transit drag links in the mushroom inserts?)
thanks again Marc

Here it is. You want the 19 mm version. The price was under £10 including postage to Lithuania. Not sure if the taper at the top end is the same. If you get the mushrooms ready made (NTS, Talon sell them) they will already have the correct taper.

Is the reamer that was doing the rounds still available?

yeah, I have ended up with one :) pm if you want it :)

michael