Invisible Pantograph Wagon

hi all, im wondering if their are any invisible wagon that have pantograph attachment point that wont leave a gap in if placed it between to coaches like mk3's, mk2, etc

i've tried silversmith's tram pole wagons but alas they leave a big gap between coaches

thanks in advance

Daniel~

Edit:

I forgot to mention that is their a wagon narrow enough to be placed between coaching stock without leaving a noticeable gap