You probably have #67 chain. Take a link to TSC or a tractor dealer and get a roll(s) of chain.
#67 has 52 links per roll. TSC or a dealer also can supply the links to which you attach the apron bars. Measure an unbent bar and go toa local welding shop and get some angle iron cut to length. Drill 1/4" holes in the ends of the angle iron and attach it to the to the apron bar links with 1/4" x 3/4" bolts. If you don't want to replace the entire chain, just replace the links that were under the manure pile. However, if you don't do a 100% replacement, you will probably have the apron fail from time to time.If it fails, usually the chain only breaks on one side, the good side keeps moving and the next apron bar to come up under the fron sprocket will bend. The secret is to keep an eye on the spreader when emptying it and stop immediately if a link breaks BEFORE an apron bar wraps around the "axle" between the front sprockets. The last time I checked TSC, the apron links were $1.67 each (note: they come either right or left) and a aroll of #67 was about $40. Before you disassemble anything, be sure to count and make a note of the number of links.
Be sure, when you finish, you have the same number of links on each side or your apron bars will get out of sync and will eventually wrap around the front "axle", bind and break the chain. Finally, You can reduce the number of apron bars but the fewer bars, the longer it takes to dump a load.
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