Newer plastic style master cylinder

nope the rod is perfect. like i said the new master cyl is drilled shallower then the original 73 up style. that same distance as the spacer. i have the wilwood master cyl. i believe the 85ish diplomat are built the same way.

and how hard you you be pulling the pedal up to get it past the brake light switch?? gotta really yank it to do that i would imagine. that thing isn't just gonna fall out i can tell you that.

I never seen two different length A-Body rods, I've used the 73 up master cylinders on the older cars with no other changes, how long is the rod you have? What master cylinder are you running? I have one out of a 85 Dodge truck but I mocked the car up with a used one out of a 80 Diplomat, both were identical. My adapter is 3/8" thick and when I mocked it up the pedal was a little too low for the brake light switch and when I pulled it up to see how far off it was, the rod fell. The company I bought my adjustable rod from said that they do fall out, that and to get the pedal height correct is why they made the adjustable one.

Some cars may not need the adjustable rod but I would double check before you test drive the car, this is not an area that should be over looked.