what are the fees associated with these funds?
You are right, there is no exact equivalent to a total market fund.
The closest you are going to get is to invest in a combination of one of the large-cap and medium-cap funds (if their fees are reasonable).
You could also add a small-cap fund, but be aware that the total market funds (e.g. FSTMX) are market-cap weighted, so most of it (~80%) is large cap -- the smallest 1,500 stocks in a total market index (out of about 3,800) make up ~~2% of the total value of the fund.