Brake line question...troubles

[verona33]

My master cylinder on my 86 the front port is larger than the rearboth in line size and thread size. However, when it coils then to the prob valve, the larger line is the same on the prop valve but the fitting is smaller. The fitting itself is the same size as the rear smaller line on mast cylinder and prop valve. What im asking, do they make single fittings to adapt down to the small thread in the proportioming valve while still accepting the larger line? When i get some money ill become a contributor i caught some flak over that.
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