There has been a great deal of discussion in the past about after market FELs. The Kubota is a great unit, balanced and designed for a SPECIFIC Kubota tractor. The threads state that Woods makes a great loader that has a bit more capacity for less money. It is more generic (designed to fit several different tractors) so is not specific for your unit. Woods makes very good attachments, so it should not be a problem.
Do a search on FEL and loaders and you'll find a wealth of information.
Turfman