Not necessarily true. Although Disney did indeed use Cooper SK2000 helmets and I've managed to acquire one of those for my project, they used Jofa for several of the shoulder/bicep pads and motocross gear for other characters' "armor". I've found the correct Jofa pads for Tron biceps but still trying to find the correct Jofa shoulder pads in the proper size. Sark's pads are not the same as Tron's.
Thank you all for the history information on hockey pads - no, I'm not being sarcastic! I started looking up vintage motocross chest protectors and many of them look more to what I'm seeking than hockey gear, and what you've described about hockey pads in the late 70's early 80's correlates with that. So I guess I'll look for some motocross "experts" to see if they recognize the pads so I can know what I'm supposed to be looking for.
Thanks!