what bridge is on your older Saber?
The S470 series had the horrid TRS on them.
And if your older Saber did not use the ZR trem, its not advisable to get the ZR trem system.
Reason, you will have to route a LOT to get it in, AND... I don't think any tech in Singapore has had any experience installing a ZR trem.
Get a replacement floyd rose, but if your trem is the Edge/Lo Pro Edge, then why change?