the roller on bottom door

A quick learner from Pennsylvania says:
M-1100/1125

SGD-R20. 180x83

SGD-C30. 80x83
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Bob from SWISCO responded:

Thanks for posting. Compare your roller's dimensions to our 81-154. Let us know if they differ, and if so, how. 

81-154 : Tandem Roller Assembly, 1-1/4
Tandem Roller Assembly, 1-1/4" Steel BB Concave
81-154
$16.23
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