David,

Steve is talking about the inside parts of each lock. Sure the original configuration was all the locks, except the glove box and single-seat rear pedestals, could be opened by the same key. However, that does not mean the insides of the locks are interchangeable. That is what Steve is referring to.

The lock cylinders themselves are shaped to the type of lock. Steve is saying it’s possible that even the smaller parts (lock pins or wafers) may also differ.

BenT

> On Apr 7, 2019, at 10:16 AM, David McNeely <davmcneely40@gmail.com> wrote:
> 
> According to the owner's manual for my 1991 Volkswagen Vanagon GL
> Campmobile, the ignition key fits all doors and the gas cap.  It does,
> too.  The only key that differs is the latch for the glove compartment.  Of
> course, if locks had been changed, that would not be true, but the vehicle
> was evidently manufactured that way.  But, I don't mean to be disputing an
> expert, just stating what works for my vehicle, and what the owner's book
> states.