Sekonic L28 c2 Lumasphere

Any idea where to get a replacement Lumasphere for an original Sekonic studio deluxe?

I dropped an email on the Sekonic site this week regarding an obscure accessory for a long-discontinued meter. I got a quick response and was surprised that they had some in stock. I was thinking that the accessories for the L-398 Studio would likely work but found this when checking just now:

http://tinyurl.com/29kpncf

I imagine there's a parts-only junker sitting in a bin somewhere with just the piece you need.... Getting together with it might be the dilemma!

Well,,, now I'm really confused. I need to go back and check my meter. It's got the bayonet attachment for the lumasphere and disk, and the push button in the center to unlock the meter.

I must say, I've had this meter since the 70's? or very early 80's and have been really happy with it over the years. Oh,,, and it was used when I picked it up.