'74 superbeetle sunroof cable

does anyone know how i could get my hands on a sunroof cable for my 74 super beetle? i'v searched allover on line and couldnt find one.

MA Motorworks (http://www.mamotorworks.com)has them.

Part#
300-870 (left)
300-873 (right)

Not cheap. $139.00 each

thanks for the help, I will check them out.