His '03 TJ uses a Mercedes steering box, they stopped using Saginaw steering boxes in 2002.Ha how much are they paying you? JK. Id just fix the seal if it was me.
IIRC the TJ uses a saginaw box.
So u can get brand new parts for them. Just because your dealer doesnt support it anymore I would source a local saginaw shop.
I actually don't like most of Lucas' products, they are known for some shitty products like their so-called "Oil Stabilizer" which is harmful junk that causes aeration of lubricants... not good Their Power Steering Stop Leak is however actually a pretty decent product.