Glacier Bay Power Flush 12 inch Rough In Two-Piece 1.28 GPF Single Flush Elongated Toilet in White Seat Included

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Glacier Bay 12 inch Rough In Two-Piece 1.28 GPF Single Flush Elongated Toilet in White Seat Included - Model 686-826

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Fluidmaster PerforMAX Universal 2 in. High Performance Complete Toilet Repair Kit

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Everbilt 3 in. Universal Toilet Adjustable Flush Valve with Flapper

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Toilet pics below do fit universal 2 or 3 inch flapper kits

Toilet pics below do NOT fit universal 2 or 3 inch flapper kits

Kohler toilet tank opening size 2 inches--too small for standard rebuild kit (although this can be forced to work if needed by cutting flush): 

Kohler toilet tank opening just a hair too large for standard rebuild kit: