Old fittings or new when changing wire

[ribbony]

We have an Adams35 cruising yacht, cutter rig of unknown rig age (most likely 10 to 15 yo) that has been Sydney based for most of its life, and sitting on a mooring for almost a decade. We have nearly completed the restoration and now need to look at the rig. Replacing the wire is a obvious step in the near future, but should we replace the ronstan sealoc turnbuckles on the ends (8mm wire on #10 sealoc's) ?

Visually they look OK and the threads run smooth on all but two and I can not access the one under the furler (unknown brand).

Regards

Mick