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i have iphone 5se, and i want to buy custom housing case like iphone 7 jet black. will my iphone 5se parts fit perfectly on my new housing case iphone 5s ? please help.

No, the internals of the iPhone 5SE are different from that of the iPhone 5s. Specifically, the 5SE motherboard is larger than the 5s.

Some, but not all parts are the same between the iPhone 5S and the iPhone SE. The screen is the same as well as the home button, front camera. The charging port, battery and back housing are different. Look for the same model device you have (iPhone SE) for the back housing you are looking for. There are lots of after market back housings as well as original housings.

Yes, you can do it. Insides are exactly the same. Only the flex cable connectors are a bit different.

The bare housing and even the speaker at the bottom is the same but the ribbon for the volume/power and charge port are different. The actual aluminum housing is exactly the same screw for screw.