Code:
<Patch>
patch_name = `Custom left & right margins`
patch_enable = `yes`
# Values for replace
replace_int = FE673C, 02, 02
replace_int = FE6740, 04, 03
replace_int = FE6744, 06, 04
replace_int = FE6748, 08, 05
replace_int = FE674C, 10, 06
replace_int = FE6750, 12, 07
replace_int = FE6754, 14, 08
replace_int = FE6758, 16, 09
</Patch>
I think is what you need. The first value Fe673c is the location in the file being patched, the second 02 is the OLD value, and the third 02 is the new value.
So all I have done is shift the replacement values up by 1