Seeking parts for an historical refurbishment

Hi folks: I collect old lighting equipment and where possible restore it to as close to original working condition as possible. I am currently working on two old ground rows. I have no date on these items and the only manufacturer label I have is SEECOL London pressed into the tin of the casing. They take a standard Edison screw 150w incandescent lamp (domestic style) and they have a glass reflector. Why glass I hear you cry? That is exactly my point. There are twenty reflectors on these two ground rows and 4 (only 4) are broken. On the back of the unbroken ones it says "Sunray" S.E.E.C.O.L London Patent No 142961. I am wondering if anyone out there has anything similar. I will try and post a photo when I've worked out how. If you have a unrepairable SEECOL ground row with 4 undamaged reflectors I would love to hear from you. e-mail: jotony@internode.on.net I live in Adelaide but am interested in hearing from people interstate as well. Whoever thought of putting glass reflectors on ground rows!