Originally Posted by
mudski
The issue with pitted slides is that they may catch on the caliper. I think you would need to replace them. The easiest but not cheapest way would be to buy another set of second hand calipers, and put a kit through them, with new slide pins if they require them. Then you can just swap them over. Or, buy a caliper kit and new pins, remove the calipers, rebuild them and put them back on.
We I did the brake conversion on my GU I also removed the rear and rebuilt them. So I just left a day aside spare and did the lot in the day.