Maybe its a good sign to convert the front to disc as well...
I'm not 100% sure, but from the research I have done, they are the same.
There are a ton of places that sell 48-52 disc conversions for the F1...
www.mpbrakes.com
http://www.classicperform.com/
www.speedwaymotors.com
If it helps, here is a picture that lists out the axles:
I have a F6 front axle and I have not seen anything for a F6 I also want to keep the big wheels 19.5
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