I don't know of any ball bearings in the speedo cable, It has probably been 6-8 years since I replaced a speedo cable in an RX7, so I am not the best source for that.
I found the parts in the Mazda parts catalog. This is available online.
I found it using a Google search.
RX7 Technical Data
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1986 GXL ('87 4-port NA - Haltech E8, LS2 Coils. Defined Autoworks Headers, Dual 2.5" Exhaust (Dual Superflow, dBX mufflers)
1991 Coupe (KYB AGX Shocks, Eibach lowering springs, RB exhaust, Stock and Automatic)
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