You know that BF247x is identical to BF246x with only different pin assignment? So it can be used as replacement. Also B and C types have overlapping parameter ranges, a selected B type might work without circuit modifications.
Nevertheless all these FET types are obsolete with only remainders availables from some catalog distributors and DIY shops. There's no one-to-one replacement. Use the best fitting high Idss VHF FET available at your site (e.g. popular types like J310/U310), modifying the circuit parameters as needed.