EMPI and Wilwood have developed a 2 piston caliper to fit directly to a Type 1 disc brake spindle (i.e. without adaptors etc), which can be ordered via Heritage Parts Centre…
Calipers feature Billet Aluminium construction, M10 x 1mm inlet to work with standard hoses Mil-Spec hard anodising for a long lasting finish and will fit AC4060 and AC4061 dropped spindles, too.
Priced at £480.55 (inc VAT), the part no. is AC61515260-0 and you can order via the website