Unimog Club UK

Hello and welcome, I presume you mean 1300l as a 1300 is a very different machine and the 1300l is a popular Unimog for camper conversion.
The parts for steering conversion are Mercedes but you will struggle to buy them cheaply. I prosume your wanting right hand drive ? Personally I prefere left hand drive as the linkage is on the left and the right hand drive lever is bloody awfull I have a right hand drive 1550L and if I could be bothered I’d change it over.
Go by engine hours on a Unimog not miles or KpH if it’s a Unimog generally a hour meter on the front of the engine later Unimogs in the cab.
Spares that’s something you’ll learn after owner said Unimog but the minimum is fuel filters x 10 and hub seals to start with.
Yes you can or could until brexit buy and import into UK I’ve not done it since brexit there’s some nice Singapore 1300l for sale at the moment high spec and rare to find now, there’s going to a shortage of old fashioned field repairable Unimogs in the years to come.
Have fun unimoging