From everything I can find it doesn't look like they ever made one.
Maybe its time someone like you makes one! You would have to have a bunch of spare 150 side mouldings though.
I saw a guy make a 55 4 dr hardtop once, car looked real good.
We had a discussion a while back about the possibility of a 57 150 4 dr. hardtop, they never made that either.
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