54" 2554 deck on 1872?
 

Mounts look to be a different but wondering if anyone has done it, can it be done?

Ten characters say no.

This is the second time I've seen this recently, what does it mean?

You can’t just type no as an answer. Answers to posts are 10 character minimum

If you had a junk 317 or 324 deck you could use the mounts and make it work.

With some fab work it could be done. I ran a 60 in deck from a 5252 that I adapted on my 1872 for about 15 years and it mowed very well. I used the mounts, hangers, jack shaft pulley assy and a modified mule drive from a GT 46 inch deck to make it work. I later ended up getting the hanger assy from a 60 in Haban because the one for the GT deck was not made of heavy enough material and it kept bending due to the weight of the deck. If you have fab skills and a welder etc it can be done. It would be easier to find a 54 inch deck from a Cyclops series or a Haban as they will just bolt on with the exception of the PTO pulley size used with some of the later Cyclops mowers. Here are some pictures of my 60 in deck I adapted. The only reason I stopped using it is I found a 60 inch Haban deck to use on the tractor I rebuilt that is in my avatar.

Rear mounts and jackshaft pulley Overall view of mounts
Attachment 95979 Attachment 95980
side view, Haban hanger assy adapted
Attachment 95981 Attachment 95982
Mounted on 1872
Attachment 95983