Changing saddles on a P?

[DF Shortscale]

If I want to replace the saddles on a P bass with threaded ones, is it just a case of buying the threaded saddles and putting them on my existing bridge, or is it better to replace the whole bridge with a bridge that comes with threaded saddles pre-installed? The current bridge is just a standard USA Fender, but I know screw shapes / sizes can vary, some threaded saddles don't come with screws etc, and I'd like to make sure it all fits as it should.

[Reggaebass]

Yeah just change the saddles, I’ve done it on a few of my jazzes as I like the threaded ones, I got the fender ones a long time back maybe from allparts, they were quite expensive though, or maybe get a hosco bridge and just take the saddles off, like this 

[PaulThePlug]

Just swap the saddles - but make sure they are the correct thread - Fender USA likely Imperial, others Metric.

 

I swapped out the Chrome for Brass on my HB50 Modder.

[DF Shortscale]

Good to know, thanks. It's odd that the individual saddles cost more than some entire bridges, I've seen a Wilkinson one for about the same price as the one above, although a legit Fender one with slotted screw heads (instead of hex screws) is closer to £60..