I would make a pattern out of heavy paper to make one. You can check on-line for what they look like. They are not a precision part.
Proud owner of a 02' ST4s (BB) grey, the stealth color.
My old ride is swinging past Pluto, other rides, some looking out, some looking in, some repairing of others and sadly the R/D on two broken and three
retired. . .
”Without deviation from the norm, progress is not possible.”
– Frank Zappa