I am just wondering whether anyone on this forum attempted to refurbish S60/V70(p2) front calipers or not?

In principle, the procedure should be straight forward:
1) take caliper off the car
2) force the piston out of the caliper
3) remove old 0-ring and the dust guard
4) polish surfaces
5) assemble in the reverse order

The reason I am asking about this is because Volvo does not seem to sell caliper repair kits for this model. Any ideas why this might be the case. I am not a fan of the aftermarket parts, however, it looks that I don't have any other option. Another question is whether calipers are any different on 305mm (usually with 16" wheels) and 285mm brakes (15" wheels). There are some posts on this and other forums that state that the calipers are the same, whilst Volvo documentation quotes different part numbers for these calipers.

I would appreciate if anyone could shed some light on this.

Many thanks