When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Those aren't easy to change - you're better off getting a core and rebuilding it.
What happened to the old one?
They are plastic and after forty plus years they get brittle and break. In three pieces. I found one but they want 70.00. I will glue mine before I spend 70