I have an 09 Sportster 883 Custom, with the 4.5 gallon gas tank. Will a seat with the number RDW-92/61 fit? I can't find much about it. Found it on Craigslist here in San Antonio Let me make this a two-part question... Is the Sundowner seat worth the money? I am on stock and ride about 80-100 miles a day back and forth to work?