Dexter 12-1/4 x 3-3/8 8K Axle LEFT & RIGHT Hydraulic Backing Plates Trailer RV (23-402+23-403) axle and spindle dimensions must match

and spindle dimensions must match the trailer’s required setup

This is the measurement used to locate where the spring perches need to be welded on the axle tube

Instead of replacing the entire axle

Hub Face: This axle is built around an 89" hub face measurement

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Dexter 12-1/4 x 3-3/8 8K Axle LEFT & RIGHT Hydraulic Backing Plates Trailer RV (23-402+23-403) axle and spindle dimensions must matchDexter 12 1 4" x 3 3 8" Hydraulic Brake Assemblies 8,000 lb Axle Left & Right 4 Bolt SKU: 23 402+23 403 Dexter Part Numbers: 023 402 00 (Left) & 023 403 00 (Right) Complete set of two genuine Dexter 12 1 4" x 3 3 8" hydraulic brake backing plate assembliesfor 8,000 lb trailer axles. Includes one left hand (driver side) and one right hand (passenger side)brake assembly. Designed for heavy duty hydraulic drum brake systems using surge or electric over