Dip Stick O-Ring part number

I need to replace the big orange o-ring on the oil dip stick. It got tightened too tightly a few times and split. I have a Titan IO-370, but its probably the same size as a Lycoming. Anybody have that part number handy? Better yet, do you have the Aircraft Spruce item number?

Thanks!

Here ya go: http://www.aircraftspruce.com/search/search.php?s=74065&x=12&y=18

O-RING

It will depend on the oil fill tube number you have. There are 2 different sizes depending on the tube and dipstick thread size. I believe they are 74065 and 74068.

Jesse