Bolt on Parts... ...that don't.

[Johnjan]

What is it with aftermarket manufacturers? On my project (so far) it took three returns for a very "grizzly" aftermarket brake company to get rear caliper brackets that fit on to the axle flange on my 10 bolt (and even then required clearancing with a die grinder), I'm now returning a thermostat housing to another prominent maker of "specialty" billet aluminum parts because it wouldn't even bolt to the intake manifold, and a very "vintage" maker of really cool engine accessory mounting brackets sent me a real "runner" of a system with a) no room for a readily available heater hose nipple to the water pump, and b) will not let you mount the main alternator/AC compressor mount if the power steering pump/pully is already in place - which is the typical order of assembly.

Does one need his own machine shop to be a comsumer of aftermarket parts?