Sock length question

[vackert-vitt.livejournal.com]

I want to buy some lace-topped knee socks from Metamorphose, but the size is listed as "length from heel: approximately 33cm". The length of my lower leg from heel to just below the knee is 41cm, so would the socks be too short? Should I order the over-knee socks instead, which are 50cm long, and scrunch them down a little?

UPDATE: In the time I spent debating which length of socks to buy, all the colours I wanted have sold out. Do Metamorphose re-stock their lace-topped basic socks? If so, how often?