Any 20inch forks will fit.
That's a BMX, and there's not a lot of difference between forks for those. AS long as you get the correct steerer tube length, any BMx fork would give you a rideable bike.
To determine the size of BMX frame you need for your bike, measure the distance from the center of the bottom bracket to the top of the seat tube. This measurement will help you choose the appropriate frame size for your height and riding style.
Depends on what's already on there, what's available, and how much clearance the bike has at the fork and frame.
The main parts are: frame fork wheels (handle)bars saddle seat post cranks pedals
BMX bikes all have the same size (20") wheels, so they're very similar in size. Doesn't matter that much as they are mainly ridden standing up anyhow.
It depends on the length of the chainstays on your frame.
All "true" BMX bikes are built for 20" wheels, which makes them very similar in size.
No. A BMX is almost entirely ridden "out of the saddle" (=standing up), so size doesn't mean that much. (most) MTBs are intended for some seated riding, which makes frame size much more important.
The Powerlite BMX bike features a lightweight frame, durable construction, and high-performance components. It is designed for BMX racing and freestyle riding, with specifications such as 20-inch wheels, a sturdy fork, and responsive brakes.
There's a small chance/risk that the wider tire might not clear the frame/fork, but probably it will be OK.
It's 1/8" width, but the length is determined by the size of the bike frame, and the size of the sprocket/chainwheel you're using.
A BMX stem is what connects the handlebars and forks to the frame.