The RAM-B-138-AP10U consists of a double socket arm, 2.5" diameter round base with the universal AMPS hole pattern, diamond adapter base and custom high strength composite cradle for the Apple iPod...
The RAM-B-138-AP8LU consists of (2 quantity) 2.5" diameter round bases with the universal AMPS hole pattern, double socket arm, locking knob and Latch-N-Lock model specific cradle for the Apple iPa...