Roller assembly for 3 leaf glass patio doors (brand unknown)

Markings that we can see is 042N. Each door has two single wheel on each corner. We want to replace with the best quality and very easy glide with ball bearings etc, maybe a double wheel stainless steel if possible for 4 doors.

Will appreciate your help on this.

The roller that your looking at is from a Milco sliding glass door,they used to be manufacture in GA in the mid 90's. The part #81-057 will not fit it as it is for a Binnings Pan American sliding glass door out of Miami, went out of business in the early 90's.
You can actually make this roller work but you would have to cut the casing.