Clutch wear depends on riding style as well as overall mileage, so it's easily possible to see some clutch slip at 58K.
Basically, you have four options.
1) Put the K12GT clutch pack in it for $710 + labor and additional parts.
2) Put the K13GT clutch pack in it for $737 + labor and additional parts.
3) Put Barnett clutch plates in it for $150 + labor and additional parts.
4) Continue riding it until failure, then do one of the above.
There's more info on the Barnett plates in this thread
Note that the BMW clutch packs include the inner hub, whereas the Barnett kit is just the clutch plates. The outer clutch housing is a separate $975 part, with slight difference between the K12 and K13 versions.
If you're lucky (and not hearing any squawking noise or feeling any judder or shake), then the plates alone will do it. If not, you may need the BMW kit with the inner hub, and possibly the outer housing as well.
No way to know for sure until you tear it down and look.
I'd say talk to your dealer or local mechanic about it, have them tear it down, then decide if you can go with Barnett or if you need the whole clutch package and housing.
'13 Dark Graphite Metallic K16GTLD, 24K miles and counting...
'09 Magnesium Beige Metallic K13GT, 60K miles miles and counting...
'02 Mauve Metallic K12LTC, 106K miles and sold
BMWLT#145, IBA# 366, MOA# 111996, SCMA# 24032
All lower 48 states plus Alaska on the K13GT in two weeks . . .
Some people see the gas tank as half empty. Some see it as half full. All I care is that I know where the next tankful is coming from...