Most Landrovers post 1953 Series 1 86's were CKD and assembled by PMC at Enfield NSW
all the Aust Army ones were CKD and would carry the PMC plate on the cabin side of the Firewall (Bulkhead in UK speak)
Standard tyre fitment for SWB series vehicles was 600 x 16 tyres on 5.00 inch rims Rover part No R231601 BUT standard Aust Army tyre fitment was 7.50 x 16 on 5.5 inch rims with 1&13/16 offset Rover part No 272309

standard on all 2/2a and No5 trailers,later vehicles had the later Leyland part numbers of AYG-3038 (au)or NRC-7578 (uk) some Aust Army series 3's had ROH--AYG-8108 = 6.00FX-16 inch rims
As for speedos, the listing that I have is Rover Part No R540134 all varients-7.50 x 16 tyres but that is in the suffix "D" negative Earth vehicle section, the list I have for Positive Earth vehicles up to suffix "C" inclusive is SM,SN3391/03 (miles)Rover R279340 109"& optional 88" fitted with 7.50 x 16 tyres.
cheers