Early '71 Panteras, Mangustas etc had the front & rear brake system reservoirs remote-mounted against the inner fender & connected with short lengths of steel/rubber tubing. Later cars like yours & mine had the reservoirs rigidly attached. By fiddling with fittings etc, it may be possible to recreate this mounting. But none of the stock stuff will work since your entire master cylinder is aftermarket, which incidently is the main problem. Also note that not just any GM booster will work- they have a stock 4-bolt mounting which needs to be changed via cutting & welding (after total disassembly) to a 3-bolt to fit into a Pantera. If it were me, I think I'd contact the maker of your conversion & ask them for advice on how to get out of this mess. THey may have a fix already in place
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