Roger,
If you use Explorer brakes on a large bearing 9", the spacers are absolutely necessary - unless you're using a set-up I haven't seen. They make up the difference between the outer bearing race and the retaining flange. Disc brakes fit on the axle differently from the drums. Without the spacers, the axles can move in and out about 1/4".
Currie stocks them, and so does Johns. The bad news is that they need to be installed between the bearing and the axle flange. I had to have my bearings pulled, then reinstalled. Of course, I had to do that anyhow. I had to replace my bearings with special units with an o-ring in the outer race to take the place of the stock axle seals. Whoever narrowed my axle hosed it up, and the seals wouldn't stay seated.
The spacers are a bear to keep in place while you bolt in the axles. I used a couple of dabs of silicone and essentially glued them to the outside edge of the bearing race.
Linky is
here.
Of course, Kyle forgot them on mine . . .
I still haven't finished the interior of my '34. I kept intending to send it to a shop, but I couldn't quit driving it. Further, it won't get finished for a while. I'm heading to Naples, Italy for a three-year tour (civilian) with Navy Facilities Engineering Command (NAVFAC), and the car will be in storage all that time. Downside is no hotrodding. Upside is a chance to have all my living expenses paid for three years, and a chance to see a bunch of Europe.
Visited a family member at Dockery Ford from the time I was 1 year old through their ownership and then ownership change to Morristown Ford. Dockery was a major player in the Hi Performance...
How did you get hooked on cars?