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Back in the fall I had the car ('68 Mustang, 390) at the local performance shop, doing the alignment after I'd installed coilovers etc. While there, they noticed the brake booster had a vacuum leak, and ordered in a replacement. By the time it came in, I had the car home for the winter, so just paid for the booster and brought it home. This weekend I've pulled out the old one and started to install the new, but they are not exactly the same. The new part is from Leed Brakes, and is to fit 67 to 69 models.
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As you can see, the pushrod sticks further out of the old one, and a major difference is that the old unit has a rubber seal that a spacer sat over. The spacer is rebated for the seal. The spacer also serves as a vent to allow airflow into the unit. The new unit did not include a spacer.
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Trying to slide the master cylinder over the studs, the spacing is off just a hair. The holes could be opened with a die grinder to make it fit. I noticed that the holes on the old spacer were already oval, and would slide over the studs on the new booster.

So - will this unit work? With the spacer or without? Any guidance from someone who's dealt with this would be really appreciated.

Thanks
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This is a real bendix booster. hog out the holes to suit the studs.
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Checkout Chock's method for setting output length.
Leave the booster loose until you get the master on, so that you can angle it.
 

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The old looks like a midland booster and the the new is a bendix booster.
I just looked at the Leed site. The new one is an aftermarket design dual 8" booster, not similar to either the Midland or Bendix. Hope it's ending well, but that the MC do not just bolt on, would make me kind of worried. The market are floded with crappy products.
 
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