Paul from SWISCO responded:
October 2, 2015
The difference between the two snap in glazing strips you picked out is the back leg that goes behind the glass. The 55-120 has a 7/16" back leg while the 55-180 has a 1/4" leg, instead. Now, considering your back leg is 0.360", I would personally suggest our 55-180 so that you don't have to trim off the excess.
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