Need to change the pulleys, ie crank, alt, water pump, ps pump.
I can't change as my trigger wheel is locked/welded to my crank pulley.
Saying that I've never had any slippage in the wet, but do have to hunt a bit for two belts when replacing them that are the same width, even ones of the same make can vary in width, as most makers actually just buy them in and box them, plus multi seem to last forever as well.
tabetha