We have a very nice used pair of AP Racing brake calipers available for sale.
They have 1.38" pistons, fit 1.25" rotors, and have 3.5" mounting bolt spacing.
They're a narrow Dynalite style caliper that fits standard superlite mounting brackets.
Please see the photos and decide if they're right for you.
Lightweight, two-piece forged aluminum alloy body.
Stainless steel pistons.
High temperature, low drag seals.
Integral bleed screw and pipe protection.
Stainless Steel wear plate & pad abutments.