The K-Liste for these show incorrect shelf numbers at the Vatican Library:

154 -  Vat.gr.28 is shown, should read: Reg.gr.28

155 -  Vat.gr.79 is shown, should read: Reg.gr.79

156 - Vat.gr.189 is shown, should read: Reg.gr.189

158 - Vat.gr.Pii.II.55 is shown, should read: Reg.gr.Pii.II.55

The manuscript workspace page for each of these shows the first image of the index page with the correct number. GA155 is also linked on the Vatican Digital Library web page with the Reg number instead of Vat. 

Thank you very much for the notification. You are right--these will be corrected.