How to adjust doors?

[Cobra Jet]

Does anyone know how to adjust the door to body gap on these E30's?  

What I mean is, is there any way I can adjust the driver and passenger door so that when they are closed, the actual door will seat closer against the body?  Is this a latch adjustment, hinge adjustment, etc?  Any info on how to do this?  I don't need a huge adjustment, just about 1/8" or so.  I'm assuming since I have a convertible that a convertible would be more susceptible to needing such adjustments over the years.


thx!