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I don't think this is a yes or no answer. I would say that in general the pushrods are long enough for a piece of metal in there but glass may be to thick. You don't want the brake peddle to over center when depressed. If that is the case, you will need to adjust it out. I ended up putting longer pushrods in my car because the peddle over centered and I could not adjust them out far enough to fit my preference in peddle location. I bought some LONG rods from ARP (get the local) and then 'machined' the head to match my girling master cylinders. I am sure that Girling has longer pushrods but I did not feel like waiting!
For your setup I spoke to wilwood about that. They said 3.5" rods PLUS the firewall thickness.
Rick
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