Unknown door mfg

A quick learner from Mt. Pleasant SC says:
Hoping you can identify mfg and strange 4 hole handle pattern. No handle/mortise hardware. 2 wheeled roller assembly. 1 rusted. Stationary panel doesn't remove. Vinyl welded corner design. Any help would be appreciated. Thanks in advance.
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Emily from SWISCO responded:

Hello! We can't guarantee what hardware you need without seeing the original but your cut out might accommodate our 82-218 mortise lock. The 82-218 is commonly used with our 82-030 handle set as long as the 3-15/16" mounting holes match up to the installation holes in the door. Unfortunately, if you don't have the original door roller that you can remove and show us, we won't be able to recommend a replacement. 

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