Spare wheel / tyre

Hello All,

Just prepping our new for us caravan for summer and I've realised that I don't have a spare wheel.

I'm quite surprised after reading around the internet that they don't come as standard so I'm looking for advice.

The handbook states my Elddis Avante has a wheel rim of 5.5j x 14 with a tyre of 185 r14 102.  It's a 5 nut wheel.

I've looked around and found wheels at this size but they have measurements following them in mm (100, 110, 114) which puts me off buying as I'm not sure which one is correct.

As for tyres I'm more than content to source those, just need advice for size of wheel rim please? Any specialist suppliers known by anyone or should any 5.5jx14 fit the axle?

Many thanks,

JP

PS - I'm not a fan of these blow in gums and emergency repair kits, I'd rather have the wheel itself.