WTB B Pillar for a 1969 Barracuda. Look at my picture

If the only issue is the striker then I would fix it. Much less to worry about that way than to replace the whole B pillar. I repaired my drivers side and reinforced the passengers side when I did the quarters.
The drivers side I welded up the cracked area and on both sides plug welded in a reinforcing plate on the inside and then welded the cage back in. Pretty easy repair that you can’t tell was ever done.