stainless crush tubes, wear?

[TalonMotorFabrication]

Can any body that has had their car on the road for over a year tell me what sort of state their polybushes and stainless crush tubes are in after this amount of use/time please?
On the Sierra based builds you can shim between the bearing carriers and the rear uprights get correct toe in/out as need be but on the MX5 it needs a different approach requiring an adjuster. What I've come up with is an adjustable crush tube that fits the standard suspension brackets and polybushes with 3/4-19mm crush tubes but I need to know how much or even if 303 or 304 stainless wears against the polybushes.