Bushes

[iMacThere4iAm]

Felicia's rubber parts are all perished but I'm not sure about the right replacements to buy.
For example, on ebay there are two types of anti-rollbar bushes as shown in these photos:

1.

12mm or 10mm

2.

12mm or 10mm

Now each type is sold in 10mm and 12mm variants, so what is the difference?

 

[Azazello]

Mine are the first set (just a look at the first silent block to see what type you have), 12 mm (measured the antiroll bar with a caliper).
Purchased but still not mounted.