Thank you for all your help guys.
Unfortunately i don't think any will work with the current stick packs i'm using as:
1/ They are fairly thick (high)
2/ The edges are rounded.
I do have some LiPo's on the way though, so once these arrive i will see if any of the solutions offered work better with those.
I find it strange though the HB offer no stick pack securing solution as standard.
Every event i've entered so far has had a restriction either on using NiMh batteries or a certain brand of batteries, as it's extremely difficult to find side by sie battery configurations these days i'd have thought a stick pack securing solution would be standard.
I suppose another alternative would be to split my current stick packs and resolder/configure them as side by side packs.
Problem then is they won't fit in all my cars.
Again though thank you to everyone for their suggestions, even if they didn't help much with the stick packs hey might well be a great solution for the LiPo's.
If anyone else is using stick packs though, it'd be great to hear how you solved the mounting solution.
Cheers
Mark