Since alternate ideas are coming up...
I cut the top off of a 7.62x54R ammo "spam can" to use as a drain pan for cubs. It works awesome. It slips in between the deck and the motor, but I usually change the oil with the deck off anyhow. For me, it's only 1-2 times a year anyhow.
A cut down gatorade/milk/whatever jug also works well (if changing cold oil). The ammo can is a metal version and is good for hot changes. I would think a cookie tin or anything that fits in there would be fine and should cost way less than $30 for the fumoto.
But... If you have your heart set on it, there are 2 ways to determine thread size... Pull the plug, take it to the hardware store and see what mating thread fits it, or use a thread gauge. I recommend option 1 since it's free if you don't have a thread gauge.
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