What does the old brakes look like? Any pics? Since they were unhooked, if all the parts are there, then you may be able to clean them up and get them working again. The brake pads are a lot thinner than older car drum brake shoes were, so do not let a thin looking lining be a show stopper. They are not that think even new. . The Dexter tolerance to replace shoes is 1/16" of brake lining material.
As Mainah stated, Etrailer may be an option. I have bought a lot from them and had a positive experience, I just have not bought brake parts from them so cannot comment on that.
And here is another option. Axle Inc in Elkhart IN. They are a. Alko/Dexter and Hayes distributor. AXLE Inc. - Towable Trailer Axle Specialists
They may have the inside track on the Hayes situation as it was thought they may have gone out of business. Alko may have bought the business.
Axle Inc actually lists some of the Hayes part numbers on their site. But it seems only in the 10 x 2 1/4" brakes. The 10 x 1 3/4 does not list the Hayes parts. You will need to measure the shoes and drum ID width you have now to help hone in on this.
Here is 10" x 1 3/4" brakes http://axleinc.com/axle-inc-document...signbrake2.pdf
Here is 10" x 2 1/4" brakes http://axleinc.com/axle-inc-documents/10x214elec.pdf
I would call them. I have in the past and they are very helpful. I bought my new 6,000# axle tubes from them. They could sell me everything and anything I needed for my Alko Axles.
Worst case, if you cannot clean up the old brakes and get them working, can't buy parts, then an axle conversion is an option. Axle Inc can have whatever you need made up and shipped. My Axle tubes came UPS to my house from them. They were made in about 1 to 2 weeks. You just need to tell them a few dimensions so the spring mount and axle length line up. They will explain how to do this. We can help is needed. Amazingly the axle tubes are not that expensive.
Hope this helps
Current Sunlines: 2004 T310SR, 2004 T1950, 2004 T2475, 2007 T2499, 2004 T317SR
Prior Sunlines: 2004 T2499 - Fern Blue
2005 Ford F350 Lariat, 6.8L V10 W/ 4.10 rear axle, CC, Short Bed, SRW. Reese HP trunnion bar hitch W/ HP DC
Google Custom Search For Sunline Owners Club