Glad itz running---whutdidja find ??
The light blocker Seeburg used there was a curved, thin, (not) flexible (enough), opaque plastic, that covered the whole lamp, and, which tended to split, if one was not totally attentive ("thinking" ?), when removing/replacing it ( I destroyed more than one NEW one--easy for me to do !).
You are going to need to build something, yourself, for that purpose--it should not block out all light from hitting the title strips, as you won't be able to read them if it does !