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Depends how old your mount is. You need the OPW. Now the heads and bodies can be interchangeable too. I couldn't get the upgrade because my RA block is entirely different and there's no room between the worm block and azimuth adjustment knob. There's an extra coupler and two more gears in the transmission train. So potentially more issues IMHO. It's only a convenience to have the motors not sticking out.
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