Where to buy quality cyl seal kits online?

I have acquired a neglected Case 580E backhoe and am going thru and fixing leaks. For front loader cylinder, i purchased two cylinder seal kits:

$19 from eBay, all no-name seals, fit and finish seemed lower than the below kit.

$32 from foxkit, included at least one SKF marked seals. Quality of fit seems more precise than the above.

My questions:
- does the use of name-brand seals make a difference ?

-where do you shop for quality seal kits?

Thanks !