Can I buy a replacement stirrer guide for a Lara Classic (i.e. serial number 1001 to 1060)?

Yes; the part number is:

• LR171150: Lara Classic Stirrer Guide (serial numbers CLR-1001 to CLR-1060)

Please note, LR171150 stirrer guide is a new, improved PTFE stirrer guide, similar to the Reactor-Ready design. (Lara Classics were originally supplied with a metal stirrer guide.)