Part number is actually a 1701221
the sort of part that is rarely available as a used item.
You may get lucky but I doubt your wife will wait that long.
No reason why that dryer should not last another five years or more if it has the grey plastic front duct. If the filter slots into a galvanised metal duct at the front then that type has front bearing & sealing problems and investing in a new timer may not be wise. There was a major modification including a complete new drum, duct, stats, seals fan etc,etc, to cure this fault.
That which can be asserted without evidence, can be dismissed without evidence.