MR500533 & MR460344
Do you have the resistor part number?
If you do, try a google seach, or search for it at megazip.net - what you're looking for is any other models that might use the same resistor - if you can identify such a model you might be able to find an aftermarket replacement.
Part no's in thread title
Update, the fan from a RHD Pinin does not fit. The motor sits about 2/3 of an inch higher, which means the fan basket fouls the fan housing and prevents it spinning, so I am in need of both parts.
I've scoured Google and neither part is available anywhere. There are some website advertising them, but they have no stock......even used items. Looks like I may, be in for a long wait until a used parts become available.

Update on fan and resistor
I've replaced the burnt out fan with one from a UK Shogun Pinin. It fits in situ and the plug fits, but the outlet pip dies not, being from a RHD vehicle - that's an easy fix.
However, the resistor is blown. Irritatingly I replaced this as an order direct from Japan in 2015 - there's a thread on here about it. A shame, as the car has probably only covered around 45,000 Kms since then, but in the heat of Mallorca running the A/C most of the time.
It looks like this resistor might not longer be available, so if anyone has one they are happy to sell, I'll have it please.....