Seeking New Steaming Light bulb - 1987 CAL 22

I'm seeking to replace the steaming light bulb on my 1987 CAL 22 and I need identifying information as to make and model. The mast is a tapered tall rig made by Z-Spars (aka Z Diffusion, now known as US Spars.com), and the steaming light is the forward light on the masthead. Can anyone help me avoid more than one trip on the bosun's chair? Please contact Bill at Se… [at] aol.com. Thanks much!