New Apple iPod Classic 6th & 7th Generation Orange Plastic / Grey / Orange Plastic (Silver) Hard Drive 120GB iPods are a mix

120GB iPods are a mix of 6th & 7th Generation logic boards

it is highly recommended not to rely solely on USB

and it's difficult for me to process and answer accurately the sheer quantity of questions that I get

iPod will not be updated or restored before shipment to preserve the iOS 6 installation

I was able to get the uDUAL to fit/close with a thin backplate and the following batteries:

New Apple iPod Classic 6th & 7th Generation Orange Plastic / Grey / Orange Plastic (Silver) Hard Drive 120GB iPods are a mix128GB 256GB 512GB 1TB iPods are upgraded with SD card storage using Tarkans iFlash Solo, Dual & Quad adapters. Please note: 120GB & 128GB iPods are a mix of 6th & 7th Generation logic boards. If you prefer one over the other, please include it in your note. All iPods come with a new USB charge sync cable! Limited Warranty Information & FAQ Access Here