3.73 differential tag

I'm going to be changing out the 3rd member out in my Duster for a 489 case 3.73 gear sure grip unit. I would like to put a 3.73 ratio tag on the housing but I am having a hard time finding one. There a ton of 3.23 & 3.55 out there. Am I not looking in the right places? I did find ONE off a Dana 60 on eBay??
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