The WD2000 rework station you are referring to was made in 1980s, as I remember.
It was not in production during 1990s (not in 1999 catalog).
Weller acquired Ungar in 1996 and by 2003, many of those models were discontinued.—
The DS101 irons appear (Magnistat/TCP heritage) on eBay.
Regarding the EC-1201(A) / ESD irons ...
I actually build these, from scratch, as needed — finding NOS parts from various sources.
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My WELLER Manual Collection (20th Century) ..... I have scanned most.
I did not use or repair their de-soldering products. Consult 1999 Catalog.http://bama.edebris.com/manuals/weller/Weller / Ungar Product & Parts Catalog, circa 1999
MANY models were discontinued in 2003 — not converted to RoHS (no lead) 21st century.
http://bama.edebris.com/manuals/weller/parts/