Discontinued - no substitute available.  Customer must replace entire pocket door track and roller system

Top Mount Roller Assembly with four 1-1/8 Inch Nylon Wheels for Sliding Wardrobe Door.
Roller consists of plated steel trolley assembly with 4 nylon ball bearing rollers.
This Roller is used on heavy sliding doors of 250 Pounds & 1-1/8 inch thickness or more.
This is a replacement for Acme 57/58 Series Sliding Hardware Doors.
Old Style Roller (part #25982) had larger wheels which are 1-1/4 inch in diameter.

New Style - Acme ReplacementNumber of wheels: 4
Wheel Diameter: 1-1/8 Inch
Wheel Shape: Oval
Center of wheels: 1 Inch
Door thickness: 1-1/8 to 1-3/4 Inch
Door Weight: up to 250 pounds
Mount: Top
Priced and Sold Each.

IMPORTANT NOTE - If at all possible, reuse old parts from original rollers. The way the new bolt connects to the new bracket is different than the original bracket/bolt design.
The original Acme had the Nut attached to the base bracket, so when the nut was turned the door would raise.
The new style bolt comes through the top of the roller assembly and is not easily accessible for adjustment.
The door has to be raised and the threaded bolt turned to adjust.

See here for instructions on installing this product. Note, instructions are geared towards original bolt/bracket design.