Amazon does sell some "CHEAP wet bolt kits" that may or may not have quality components. If you order a MorRyde wet bolt kit, you'll get "quality made in the USA" products. So, you want to buy a MorRyde brand wet bolt kit.
That said, your trailer may have a "wide spaced axle configuration" so the equalizer would be different (longer to accommodate the increased space between the axles). But if you have the "standard spaced axle configuration" than you'd need a shorter equalizer.
There are several brands on the market. I have the CRE3000 equalizers on my trailer. They are also produced by MorRyde, so quality is going to be there.
You need to determine the wheelbase for your trailer before you start ordering parts. Measure the axle spacing by measuring centerline of the front spindle to centerline of the rear spindle. Standard suspension is 33 inches. Some heavy duty trailers are 35 inches and wide spaced axles are usually 42 inches. So if you have the wide spaced axles, you'll need a special size CRE3000 equalizer set for your trailer.
All the MorRyde parts are available on Amazon as well as at most trailer supply parts houses. I'd urge you to stay away from the "no name" or "funny named" wet bolt kits. Stick with the "industry standard" (MorRyde) and you can't go wrong.