If I were you I would see if I could source a set from the junkyard. Replace the bearings on the fans and you should be good to go. I've got like 10 bearings I bought a while back, havent gotten around to doing it yet.
Here are the bearings that you should use. I found them in a thread a while back.
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=140677210093&ssPageName=ADME:L:OC:US:1123#ht_937wt_905
Here's a parts list EDIT: Just realized I used the wrong chassis, but these are the same for the 124.090 as well. Looks like dual fans was part of the 89 facelift.
From the looks of it... should be removable without having to take the condenser out.
__________________
Cruise Control not working? Send me PM or email (jamesdean59@gmail.com). I might be able to help out.
Check here for compatibility, diagnostics, and availability!
(4/11/2020: Hi Everyone! I am still taking orders and replying to emails/PMs/etc, I appreciate your patience in these crazy times. Stay safe and healthy!)
82 300SD 145k
89 420SEL 210k
89 560SEL 118k
90 300SE 262k
RIP 5/25/2010
90 560SEL 154k
91 300D 2.5 Turbo. 241k
93 190E 3.0 235k
93 300E 195k