King Shower Door Roller Installation Hole

A quick learner from New York says:
October 9, 2018
Discussion number D56963 , How do I find the part for the attached shower door rollers, King ANSIZ971-1984. Do I actually need to drill into my glass?
I don't know why, but the installation guide, step 8 says drill a new hole. And that new hole is 7/8" away. (7/8" away from what?)
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Tom from SWISCO responded:
October 22, 2018

Yep, our 10-058 looks like it'd be a good match. For step 8 in the instructions, you'd be drilling into the frame, not the glass. You want to avoid drilling into the glass at all costs. The new hole is 7/8" from the old hole, as indicated by the illustration.
Shower Door Roller and Bumper Kit
Shower Door Roller and Bumper Kit
10-058
$32.12
SWISCO 10-058 Shower Door Roller and Bumper Kit
SWISCO 10-058 Shower Door Roller and Bumper Kit
VIDEO
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How to install the 10-058 shower door rollers
How to install the 10-058 shower door rollers
GUIDE
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