You will need to buy the fan with 0,25A rating. I did locate exactly the same model on Aliexpress here:
https://www.aliexpress.com/item/95MM-T129215SM-0-25AMP-Graphics-Video-Card-Cooler-Fan-FOR-ASUS-DUAL-RX580-O8G-Graphics-Card/32858768243.html?spm=a2g0s.9042311.0.0.49484c4dF3pTBT

Why did the fans on the Asus RX580 Dual fail? I have my theories:

1) Graphics card might have run too hot with too high fan speed over prolonged time. Or in a dirty environment.
2) Physical damage - fan blade being pressed on, thus damaging the bearings. The construction is so that the fan is located above the fan shroud, thus unprotected from physical trauma.

I bought mine RX 580's used without warranty. So I am forced to fix the problem myself. The fans I bought works fine. I will order more. 3 of the 4 RX 580's I bought are have the same problems. On some both fans were faulty, on some only one.

The fans on the Sapphire Pulse and Nitro are superior to the Asus Dual, and they are easy to change too. Also build quality on the Sapphire cards are superior.

Value of PGN is so low now so no more point in mining it. Once my "holdings" were worth about $70, now a measly $4. I will hold on to what I have. Maybe someone will come and revive the project.

Regarding stuck wallet. I downloaded and installed the "new" wallet v0.15.99-3. It was also stuck on syncing as was the older 99-1. Then I checked the nodes settings and found out that there were some blocked nodes causing the wallet not to sync. I unbanned the first one, and the wallet started syncing (12 weeks behind etc).  Strangely there were no new transactions after 04.05.2018. Not 100% sure if I mined after this date, but it's suspicious. Probably everything is ok, but I just thought I'd mention it.