Two Wheels Better

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Number of posts : 4841
As for water/oil pump pieces there are 'kits' available but, of course, as stated previously, one would need to know which year/model you own for the correct bits to be obtained. If there's no sign of coolant in your engine oil and the weep hole at the base of the pump is dry I'd leave it alone for the future.
Here's a piccie from Motobins UK of a 'kit' to fit most Ks.

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1970 R60/5, '77 R75/7-R100, '85 K100, '87 K75C, '87 K100RS, '93 K11-K12 Big Block, '93 K1100RS, '95 R100-Mystic, '96 K1100RS, '98 K1200RS, '00 K1200RS, '02 K1200RS, '03 K1200GT, '04 R1150R, '04 R1150RT, '05 K1200S, #1 '06 K1200R, #2 '06 K1200R(renovated), '07 K1200R, '09 K1300GT(refreshed), '13 R1200RT-P & 2022 S1000XR(sold)
All of life is a foreign country. - Jack Kerouac, author (1922 - 1969)