As that last post was about 4 years ago, you'll be lucky to get an answer. Hope so. Maybe , just maybe, a call to J & R may help. I'll try and look up the number or someone else may pipe up sooner.
Latest number I can find for J & R is 740-392-1602. These gents are kin to the original Hi Lo factory. They have all the knowledge about Hi Los. Maybe they can help you out. Maybe a hidden place for the VIN. Worth a shot.