the hat,
Those bulb tees don't even show up in the structural shapes books anymore. They were used in concrete as Tim described, and for connecting sheet pilings, and probably for some other uses too. The tee is rolled similar to a structural tee but with a bulb on the stem. Can't just split a wideflange to make one of those rascals.
Tim, can you opt out of the bulb tee and go with a rail section? The rail will be hard and the dozer blade should just slide right along without gouging in.
Sorry, I couldn't find a supplier for bulb tees.
John Wright