Koni shock adjustment?

The shocks are adjustable in damping only, not in height. If you want to change the height, you would need to send them to Carobu to have them modified with machined threaded collars and spring perches installed.

Otherwise, if the rear of the car is too high, maybe there's some large amounts of FRONT A-arm bushing degradation, or the rubber spring perch inserts are collapsed.

I noticed about a year after I did my suspension rebuild (involving replacing all of the rubber bushings), that they've compressed now and the car sits fractionally lower (still rides very well though).

Is it possible for you to post side-profile photos of your car to illustrate the ride-height discrepancies?

 

The shock eye bushings have a lot more influence on ride height than a-arm bushings as they compress and degrade over time. Perhaps the rear shocks got a refurbish more recently than the fronts on your car? If you pull the shocks you will probably find the center metal tube has migrated signifcantly toward the center of the shock.

I replaced the bushings on my GTS and the car went from a slightly lowered (and good looking) stance to the stock stance. I got them on eBay from Maseratisource.

In that picture above the front down, rear up makes the GT4 look very Stratos-like!

 

It's an old car. The springs could be getting tired if they are still original.

I replaced my springs, and then machined different spring perches to get the ride height I wanted. Not the easiest method. Most folks take the QA-1 approach which is reasonably priced and offers the adjustment you want.

 

The rear does look too high.

I'm still using the 14" wheels and there's very little gap between the wheelwell opening lip and the tire tread (photo taken last year):
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My original springs were even lower than the brand new lowered springs I bought! I have pics in my restoration thread with them out on the bench side by side. I also have a chart with all the rates in there.

 

That rusted part below the lower spring perch looks non-stock to me (and might have been added to raise the rear ride height) -- just a thought...

 

Disassemble the shock/spring assembly and compare to the stock 308GT4 parts diagram (although removing the spring requires the proper equipment to do it safely).

Most likely, it is just an added part that is inbetween the half-rings and the lower spring perch (raising the lower perch relative to the lower shock mounting point). Probably no original part needed -- just remove the added part (but, even if you need the half-rings and the stock lower spring perch, they are common Koni parts so won't be unobtanium).

Here's a shot of what the bottom end of a stock Koni at the rear of a 308 looks like (note how much closer the lower spring perch looks to the upright -- and no rusty bit below the perch):
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And although for the front, this figure describes the stock 308 half-rings and stock lower spring perch -- the rear uses the same groove-in-shock body + half-rings to retain the lower spring perch:
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The Teflon washer that sits on top of the shock body prevents the bump stop from getting pulled down into the shock body by the piston rod when the shock compresses.

 

The P/N on the shock body is correct, but the spring perch is definitely the wrong item.

Here's a close-up of the half-rings holding the spring perch to the body (and yes, that's how rusty the shocks were!).
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Take Steve M's earlier advice for removing the springs. Be VERY careful when using spring compressors on these and USE the little safety hooks that come with the compressor's kit...

Which bushings are you talking about, the eye ends or the pads inbetween the springs and perches?