I don't think it would be easy to locate those parts unless you have a hardware store locally that you can take parts to compare to and find an EXACT match.
Don't these screws have SPRINGS with them?
There are other fairly inexpensive coolers too if need be:
https://pcpartpicker.com/product/hmtCmG/cooler-master-cpu-cooler-rr212e20pkr2
Make sure the CPU cooler has no issues with:
a) height (case)
b) mounting socket type (i.e. AM4 is new)
c) CPU_FAN (most are 4-pin, but some older mobo's are 3-pin)
d) CPU cooling capacity (if higher-end CPU need better cooler)
Other:
You may also want to investigate:
CPU fan control (i.e. motherboard fan software, otherwise usually applies BIOS fan settings)