Sliding door rollers

A quick learner from DE says:
Our sliding doors appear to be Pella or that's what is on the handles. We need 8 rollers total for 4 doors. What might be your cost for 8 of them?
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Bob from SWISCO responded:

Hello there. This looks like our 81-138 Tandem Roller. Compare the dimensions below to your old part and let me know if anything differs. Pricing is listed on the 81-138 Shop Page. Let me know if you have further questions.

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Alternate image for 81-138

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