What is the difference between your P/N's 55-120 and 55-180?

A quick learner from Dallas, TX says:
What is the functional difference between your P/N's 55-120 and 55-180 snap-in glazing. I suspect either of these might work for my application, but the horizontal "tail" on mine is 0.360" vs. 1/4"/0.250" (55-180) & 7/16"/0.437" (55-120). Which should I choose? Thanks!
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Paul from SWISCO responded:
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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