While the Sperber IR fitted to Panthers would be a pretty small component, (quite a bit smaller than the Dust version Steve used on his excellent Panther) & while you probably could squeeze them onto a sprue, Heer46 do a very good one in pewter (both turret commanders scope & drivers) & Company B also do the 60cm IR searchlight & drivers scope for 251.
They probably could be included in any future upgrade sprues, but if Rubicon are considering moving into resin/pe parts it might be a better way to produce lower volume parts such as these - I'd certainly be up for a few.