I don't think SSL/TLS allow key lengths > 128 bits with RC4. Export is 40 or 56 bits. You can see most supported ciphers here: https://www.openssl.org/docs/apps/ciphers.html

e.g:

    TLS_RSA_WITH_RC4_128_MD5                RC4-MD5
    TLS_RSA_WITH_RC4_128_SHA                RC4-SHA
    TLS_ECDH_RSA_WITH_RC4_128_SHA           ECDH-RSA-RC4-SHA
    TLS_ECDH_ECDSA_WITH_RC4_128_SHA         ECDH-ECDSA-RC4-SHA