Searching for Here is the part number: Bolt - Handle P

A quick learner says:
September 8, 2020
Here is the part number: Bolt - Handle Package: Stone: 1275210 For Andersen sliding glass door
Need bolts for handles
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Bob from SWISCO responded:
September 11, 2020

This looks a lot like our 88-013 and 88-014 Andersen Handle, in which case the 393-109B Andersen Bolt should work for you. 
Andersen Interior Pull Handle, 5-1/2"
Andersen Interior Pull Handle, 5-1/2"
88-013
$37.95
Andersen Exterior Pull Handle, 5-1/2"
Andersen Exterior Pull Handle, 5-1/2"
88-014
$37.95
Andersen Bolt
Andersen Bolt
33-109B
$1.02
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