On my 182 the tabs are on the door side.
I have a vivid recollection of the passenger side
belt hanging outside with the door shut.
Thats bad for the belt and can be really hard on the pant
if you take off like that. A good reason
to have them buckled when not in use.
When I go to buckle up, my buckle is usually sitting on the passenger seat.
Come to think of it, all the vehicles I own with belts have the tabs on the door side
Michael

Ok I have a even split amoung the two people. Can anybody else help me?

  I was referring the retracting shoulder harness type.  our shoulder harnesses attach from the center cabin ceiling so the buckle has to be near the doors. If you don't have shoulder harnesses - I guess that theory is out the window..

"come off from the latch" ???  and "don't secure very well"??  A bit confused on what your belts are doing....

"tend to come off from the latch on the seatbelt itself"

This seems to be a common problem of the old nonretractable type shoulder harnesses; my 172L's harness is always disconnecting in flight. 

I saw a beautifully restored 182 at the Homecoming that had BAS (I think) seatbelts with a ceiling-mounted inertial reel.  It looked like a much better system.