upgrading master cylinder

[badmopar67]

I just switched my master cylinder to a manual disc brake one I've had front disc brakes for awhile no problems I just wanted one with a bigger reservoir well after searching I found out that 70 road runners must of had that option the only thing is that the studs that hold it to the firewall are slightly bigger then my drum brake master cylinder uses does anybody know were they can be located or this might be one of those rare times that they can't be had

 

[wedge69]

What are you looking for the master or the studs ?

 

[badmopar67]

Just to studs on the 70 RoadRunner there slightly larger diameter then the 67 coronets are