If all it's failed on is the seat and brake pipe I'd fix it/have it fixed.At worst a second hand seat should be available from someone breaking such a car or a breakers yard for not a lot of money.As for the brake pipe I'd replace the whole pipe as there's no way without dropping the tank of telling the state of the pipe above the tank and I believe[although don't quote me on this]that a new length of pipe can be routed around the tank rather than the expense of dropping the tank.
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