a short 10mm fine thread bolt did the trick on my 99

 

A screw wont work - you need npt threads which you can find on a pipe plug.

Get a 1/8" NPT pipe plug. Unplated cast iron will work just fine. Use some hightemp coating on the threads if you want to take it out later (Coppercoat or Nickle Neverseize)

 

i didnt put nothing on it but i found me a 1/8 pipe plug i will put something on as soon as i can get out to buy something thanks alot guys

 

Not a problem. I have $125 into them will sell them that to you shipped.