I wanted to make a custom fire man model, But I could not find the fire man hat file, any Helps please ?

there is no specific file that contains the fire mario hat/head textures.
I'm not sure where the fire mario head palette is but I assume it might be shared by the fire mario body palette.
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tmk the way the fireflower colours (and pipe colours) work is the model has a big palette with all the powerup palettes and simply offsets it depending on the powerup in use. nsmbe shows this for the mario body model but it has trouble with the head model and the cap model, so changing those palettes are less straightforward. for the latter you can probably manually edit the colours in nsmbe, for the former id say
1. import this file into a garbage rom or over an unused file
2. import graphics like normal and save
3. decompress mario_head_cap_LZ.bin. it may also be worth taking note of the decompressed file size
4. open the imported file and mario_head_cap_LZ.bin in the hex editor
5. in the imported file, copy everything from 0x00A4 to 0x08A3 and paste it over everything from 0x4074 to 0x4873 in mario_head_cap_LZ.bin. then, copy everything from 0x08A4 onward (should be to 0x0CA3, the end of the file) in the imported file and paste it over everything from 0x4DD4 onward (should be to 0x51D3) in mario_head_cap_LZ.bin.
6. save mario_head_cap_LZ.bin— if everythings gone right, it should be the same size as it was earlier— and re-compress it.

do keep in mind that for the head and cap models, the fireflower palette i believe is used for the star too; depending on how you changed the colour this may look particularly odd when compared with the overalls