finding A/C compressor part number help please

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My 2005 Sirion 1.0S recently had a service ( 57k miles) with my trusted mechanic.
He has advised that a noise coming from the A/C compressor is the bearings wearing out and at some point will fail ( bearing). Anyone know how long this could last,, varies i guess?
A new a/c comp start around £500 as far as i can make out, so my mechanic is happy to fit a used unit if i can source one. Found several under £100 used with warranty, but how do i know the correct part number please? I have taken photo of plate but don't know which part is the part number.
Denso
SV07C 447260- 5055
DESIGN PRESS 12F 3203
HIGH SIDE 3.5MPa LOW SIDE 1.67MPa
HFC134a
only use ND-OIL 8 JAPAN

Any help ,advice or pointers would be welcomed thank you .

( ps , can't work out how to attach a j.peg)