Connecting old LaCie FW drive to new iMac/Os 10.5.1

I want to attach an aged (purchased 2001) LaCie 60GB external FW drive
to a new 2.2GHz iMac running Os 10.5.1.

This drive hasn't missed a beat in 6 years of constant up-time attached
to a cherished PM7500 running Os 9.1 but I'm thinking I shouldn't just
plug it in to the new Mac without upgrading its firmware which has
never been upgraded before.

Trouble is, LaCie's website gives no clues about its older products or
older firmware updaters so can anyone tell me what update I need to
apply - presumably as soon as the drive is connected to the new Mac?
And I would hope that the drive would continue to work with Os 9 after
applying the update...

Thanks for any help.

Stan