Stock 65-67' Mustang 4 piston disc brakes work fine on the drum brake spindles. I've used this swap several times throughout the years when disc brakes were easier to find in the bone yards--I have 67' discs on my Clone GT race car in my sig which originally had drums. There are no advantages to the 67's over the 65/66's, that was just the donor car at the time.

The 65-67' discs use an adapter that bolts to the same place that the drum backing plate is currently attached. The bearings that come with the discs are the correct diameter for the drum spindle too.

About the only issue I've had with this swap is that there is a variation in brake hoses throughout the years. 67' style has a different end on the body side, but the 65/66 disc hoses can be swapped. There are other small variations between the 65/66 and 67' sets, but if you get the complete set off one or the other, you will have no further issues.

As mentioned above, swapping newer style single piston disc brakes normally will require the matching spindles.

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Dennis
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65' STANG (3330 lbs), 393W NA, Toploader 4 Spd, 4:11, AFR 205's, Vic Jr. Intake, CI Custom SFT, 750dp, 11.0 CR

11.25@122.19mph