I had a similar question earlier... here is the answer I got.
"I have found your lens at the below dealer. Give Josh a call at Uhlmann RV, and be very specific which cover you want, the frosted cover or the bullet lite cover. They have both in stock. I saw them in person on Thursday last week.
www.uhlmannrv.com
800-245-5378"
I haven't contacted him yet but you might give it a try.