I would only bother looking for the Kubota LA853 orginal loader. It is strong, but more important, it seems to have the best integrated mounts for the 5030.
I've not been impressed with the aftermarket loaders for this tractor, I've seen a Frey, Hardy, and a Westandorf(spelling?) fitted. If ALO made a loader for it I'd consider it but I don't think they ever made the mounts.