I replaced my topping lift two years ago on our 93 Hunter 30T. I have the work sheet and invoice. The finished length is115’ which includes a whipped end and eye splice. The line is New England Ropes VPC: 8mm (5/16) diameter. Like I mentioned, 115’ is the finished length, not sure what they added for the eye splice.
I got it online from Annapolis Performance Sailing, the cost was $160.53.
Unfortunately the no longer do running, not sure why, as they were very good at it.
You can also figure the length by using IJPE dimensions which are given on this site under Owners Resources- Boat Information by Model- Specifications.