Several years ago I bought stainless steel "caps" from Defender Marine. They were on clearance. I think I spent $ 1.00 for each. They were slightly larger than my stanchion. You simply removed the lifeline and placed the "cap" over the stanchion. Then drilled a hole through the stanchion and ran the lifeline. I'll be on the boat this afternoon and see if I can find one with the labeling intact. If so, I'll post the item name and manafacturer. That make looking for something a little easier.
I have been on this site for years and the information has been invaluable. I still wonder why (sometimes) people don't answer the question and and then provide options that have nothing to do with the "root" question.
New stanchions...really? A $1000.00 in parts and hours in labor to address something that may cost $ 15.00 and a couple of drill bits.
But, then...I'm a cheap ass-bastard.