12-1/4" x 3-3/8" trailer brake shoes replacement kits (2 pairs) - 21030 New 12-1/4"X3-3/8" electric trailer brake shoes with linings for replacement works with most 8K/ 9K/10K GD electric trailer brake in the market Includes:2 pairs of shoes for 2 brakes/1 axle Exchange with Dexter part# 040-350/040-351