No idea where to get parts but if your doing it yourself save some bother and do the bushes at the same time and think about the shocks too.

If getting a garage to do it still think about getting shocks and bushes done as if the bits are off the car anyway it is only a wee bit more labour to get the replaced while they are at it.
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P.Allison fixer of big engines Mk2+Mk2a signed by God / Hacked by the Lord Aberdeen Scotland