brake pedal too high

That is the same MC i have on the two cars im having trouble with. That little tab is very soft and not very safe. When trying to install the adjustable push rod to lower my pedal, i tried pulling up on the pedal to unseat the rubber retainer on the origional pushrod and it just pulled the piston out the back and dumped the fluid all over the new carpet. Then I noticed a buddies car had the snap ring style, that places the piston a little deeper into the bore, so I tried to fab up a tab that would push the piston in my MC further into the bore to lower the pedal. It wouldnt let the brakes release properly, so that was a no go. Is there i different part number for the MC with the snap ring? Or would it be wise to switch to the newer aluminum style MC?