Measure the old spokes and check ebay, used to be much better pickings but still not bad in odder lengths which an old 27", 36h?, box section rim will have. Built a pair of wheels last month, and paid 36.00 plus tax for 2 wheels, stainless butted wheelsmith. For an old rider I wouldn't worry about butting or fancy, just whatever is stainless, name brand, and the right length.