Hello all. When I bought my Kubota tractor about 5 years ago and also bought a Land Pride RCF2060 bush hog. The gearbox fill opening had a metal screw in plug that I lost. The owner's manual says "IMPORTANT: This implement is shipped with a vented dipstick." Mine did not come with one. Should a get a replacement or just go with a metal plug. And if the plug is ok, what is the type of bolt should I get. Thanks for any help. Raleigh.