Just google up 26" drawer slides. Brings up a whole passel of sites, including Amazon.
If your going to replace just a part, why don't you just get a complete new set, and make them ball bearing slides. Very easy to replace them, and ball bearing slides will make your better half very happy.
Steve & Cheryl + Charlie & Casey, our furry kids.
2012 Forrest River Lexington 283ts
Toad, 2013 Subaru XV Crosstrek
Camping trips this year so far...8