I usually make my own by cutting an 1/8" by 7/16" groove in 5/8 to 3/4" material.
Here are a couple of options:
I just found this one online. Have not used it.
I have used this on steel door frames with great success:
=Search+by+Pemko+Product+Number&openFilter=loadPem koPartNumberSearch&partNumber=306dqd&partCategoryI ds=306DQD%3A899
Not sure that I understood your search exactly.
Did any of these ideas help?