Re: Upgrading a Std trem?
Std. Dl isn't an actual trem, it means "standard double-locking"
Do you know exactly what year your 450 is? If it's post 2011 it should have the edge zero II trem, which like the original edge is good and woudln't need to be replaced. Before 2011, it would have either an edge III or a trs bridge. the ILT1 hasn't been used in a while.
If it has an edge III (more rounded shape) I would swap an edge pro into it. It will directly swap.. If it has any TRS bridge, an original floyd would be suitable.
Also, if you're getting a new bridge I would replace your studs. This is sometimes overlooked, but can really make your guitar like new, especially if the old bridge wore the old ones out. Rich at ibanezrules.com sells ibanez locking super studs.