1964 Valiant Single to Dual Master Swap Question

T0dd said
Thank you all for your bits of wisdom. I see you say "if you want to" does that mean it is not necessary to use the boot/spring retainer if I don't want to drill & tap? User 64conv65hard suggests I can un-mount the single pot and leave the push rod in place and just drop in the new?

If it isn't clear I have never messed with an MC before so I am just trying to plan out as much as possible before I disable the brakes in the car for the swap.
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The MC you pictured has the clip holding the piston. The original MC does not have this clip. The stop keeps it from pulling out. The push rod also needs the ring/grommet/retainer at the tip holding it in the piston. It will most likely tear when you pull it out. I used the 67 manual MC10-1323M . It has the holes for the bolt and stop and they include the retainer.