5 inch wheel with 4.3 inch width with an additional 1.39 inch caliper spacing. 

MATCO mfg manufactures an extensive range of master cylinders for brake applications. MATCO mfg's MCMC-4 master cylinders use a REMOTE reservoir and are offered in different models. They can be mounted vertically or horizontally (Universal) to the exterior reservoir and can be used in individual or dual brake applications. They use a  0.625 inch diameter piston and Buna-n o-rings. Mil-H-5606 aircraft hydraulic fluid or compatible fluids are reccomended. DOT5 may be used but not DOT5.1 which contains glycol. DOT3 and DOT4 may not be used and will cause immediate damage to the seals. Tested to a maximum of 1200 psi. Normal operation: 400-600 psi. The MCMC-4 has an adjustable clevis.

MCMC-4 Product Features & Specifications:

Umiversal - Vertical or horizontal mounting with exterior reservoir.

Buna-n orings 

Measures 8.05 +-0.25 inches from end to end.

Measures 7.5 +-0.25 inches from mounting hole to mounting hole.

A 0.625 inch diameter piston is used.

Stroke is approximately 1.388 inches.

Displacement is 0.43 cubic inches.

The ports on all MATCO mfg master cylinders are 1/8 inch NPT (except the MC-4E).

MCMC4A is 0.50 inch shorter that the MCMC-4.

MATCO mfg's PVPV series parking brake valves have been designed for installation in a wide variety of homebuilt aircraft applications due to their light weight and easy in-line installation . In-line installation can be used in conjunction with either a single or dual parking brake system set- up with the respective use of valves  PVPV-S or PVPV-D available in single or double sided configuration.