Nato hitch - confused

Could anyone tell me where I can get the following from for my nato hitch on landrover 90;-
1 x outer plate 195 x 120 x 8mm
1 x inner plate 195 x 85 x 12mm
and m12 bolts 150 mm 8.8 strengh

thanks

Local steel stockist or welding/fabrication company

Sorry for waking up an old thread but I have just found this looking at Sankey trailers on google images and thinking of buying a Sankey trailer and just wondered when fitting a Nato hitch to a S2a swb fitted with 750 tyres what hight to fit the Nato hitch as I am looking at getting the MK3 model hopfully with the towing eye fitted on top of the sankeys draw bar, will the Nato hitch fit straight onto the X member and be at the right hight or would I need to fit an adjustable tow plate to the X member