The 7a has separate battery, screen, rear-cover and 5G mmWave antenna guides, with its own model-specific manual.
What to check before buying
Back and front
iFixit distinguishes rear-cover work from front-screen replacement. A phone cracked on the back is a different parts job from a failed display.
Battery and antenna
The battery and mmWave antenna are separately documented. Some market variants differ in cellular hardware, so the device identifier matters for antenna parts.