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drawes are like hens teeth mate,you either by new or make your own
there are plenty of drawings and pics of diy sets

enjoy

if ya cant climb it its to steep
if you cant go down it its to steep
and if ya try to go around it you,l roll over

have a look at the local quarrys they would have a bit of belt laying about

cant help there but id use the conveyer belt

one for the spare wheel would be much easier
most 4x4 outlets carry them

in good condition and working there worth a small fortune