Battery box grommet

Any ideas where I can get one? Or three!
I have the YRM battery box, 35mm holes. I called YRM and they dont supply the grommets as, like me, they cant find 35mm grommets anywhere. Standard seems to be 32mm or 38mm.

I have the added issue that rather than a single cable, I have several plastic split conduits coming into the box at each hole, so I dont know how best to seal this up.
Anybody had any good ideas?

https://www.amazon.co.uk/gp/offer-listing/B00TX427WS/ref=dp_olp_0?ie=UTF8&condition=all
plenty available on eBay as well if you are happy to wait for international delivery.

if not I suggest a 38mm one of these:
https://www.ebay.co.uk/itm/HSS-Blac...hash=item2acca419b9:m:mWq2klp4T70mRfhtK5inl3g

Pop rivit aluminium over the holes and cut new holes in that?
Edit- or a rotary file in a drill and open them up carefully.

a simple google search and...hey presto, 1000's of 35mm grommets

https://www.google.co.uk/search?ei=...hUKEwi2wZeii77pAhXON8AKHaRzDRoQ4dUDCAw&uact=5


eta: "About 1,170,000 results (0.38 seconds)"

Also, some of the long lead tomes mentioned on Amazon seem to be the result of caution. We've bought a few things from them lately and it looked like they wouldn't be here for weeks and weeks but in fact they turned up quickly. I think they're managing expectations in case there are delays as a result of the various Covid precautions.

If there's likely to be space around the conduit, maybe get blind grommets and poke a hole in just big enough to get the conduit through. It won't be watertight but should suffice to keep a lot of the road spray and dirt out.

Some sort of putty would do the job?

a healthy bead of black RTV seals up grommets very nicely