Replacement cap for zebra light h51?

[NotTheBus]

I've lost the cap to my well loved zebra light h51w. Zebra light tells me that they no longer have parts for that series. Does anyone have a cap from a dead h51, or know a currently available cap that is compatible? I see that nitecore lists their spare caps, but I assume all are too big since they are using 18650 size cells.

I've got a LED lenser MH3 as a bargain replacement.. nice lens but I miss my zebra.

 

[MX421]

I believe all the H5X series have the same cap. I think the SC5X AA series is the same as well...

When i get to the house, i'll confirm that my H502/H52 fits my SC AA lights...

 

[NotTheBus]

We have an h53, it threads on but is a different length, and does not reliably connect power