Pull-Up Bar question

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We just got the P90X program and my boyfriend is anxious to start. We need to get a pull-up bar, though, and this has raised some concern. We live in an old apartment and the trim/molding on the doorframes is between 4.25- almost 5 inches wide. It seems that many of the bars I am finding online are for trim up to 3.5 inches wide. Has anyone else encountered this problem? Does anyone know of a bar that accommodates wider trim? Thanks!