6v battery caps

 I've been searching the internet with no luck, and when I ask the guys at the local auto parts stores I get nowhere.  Just about ready to get the jeep off the jack stands and I don't want the acid splashing out when I take it for a test drive. Figured I'd see if any of you have any good ideas for sourcing or fabricating. 

I figured the 'how in the world did that happen' questions wouldn't take long   I don't know exactly - I had it stored at my grandmother's house when I was between houses, and best I can tell is my uncle must have popped them off to check the fluids or something. All I really know is that there was only one left when I towed it down here. Thankfully somehow the fluids stayed in place on the trip here. 

I'm on Long Island so there's virtually nothing in terms of salvage. Tried the parts stores to scavenge caps from dead batteries without luck. 

I had found this link a while back but wasn't sure if they'd work since they're quarter turns and the cap on my Napa just pops on. I guess all things considered worst case I'd only waste a few $ if I give them a try. 

https://www.flowsystemsusa.com/battery-caps.html?gclid=EAIaIQobChMIyvifp_jW9QIVFm5vBB35XQh0EAQYASABEgLAZvD_BwE

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