G'day Bitten, the clutch hub wear is pretty normal and long term the biggest issue you will face is the clutch may become a little 'grabby'. You could file most of the indents out and this will help smooth the take up when being released. < 1mm isn't what I'd consider bad
the clutch friction plates of which there are 8 are the same as listed below. Ebay is the place to get them cheap. I recently scored a couple of sets from Borneo for my TM/RM125's (7 plates in each) for a mere $12 a set and $8 postage. I highly doubt you will find anything cheap locally as genuine list price is around $18 per plate
Cheers
Part # = 21441-40402
Part Description = PLATE,CLUTCH DRIVE
Model Count = 44
DR250D 1983 250 DR250 DUAL PURPOSE
DR250SZ 1982 250 DR250S DUAL PURPOSE
DR250Z 1982 250 DR250 DUAL PURPOSE
DR400T 1980 400 DR400 DUAL PURPOSE
GN250D 1983 250 GN250 STREET
GN250F 1985 250 GN250 STREET
GN250Z 1982 250 GN250 STREET
GN400LT 1980 400 GN400L STREET
GN400TX 1981 400 GN400T STREET
GN400TZ 1982 400 GN400T STREET
GS450ET 1980 448 GS450E STREET
GS450EX 1981 448 GS450E STREET
GS450EZ 1982 448 GS450E STREET
GS450EZ2 1982 1/2 448 GS450E STREET
GS450LD 1983 448 GS450L STREET
GS450LF 1985 448 GS450L STREET
GS450LG 1986 448 GS450L STREET
GS450LT 1980 448 GS450L STREET
GS450LX 1981 448 GS450L STREET
GS450LZ 1982 448 GS450L STREET
GS450TXD 1983 448 GS450TX STREET
GS450TX 1981 448 GS450T STREET
GS450TZ 1982 448 GS450T STREET
PE250T 1980 246 PE250 DUAL PURPOSE
PE250X 1981 246 PE250 DUAL PURPOSE
PE400T 1980 397 PE400 DUAL PURPOSE
PE400X 1981 397 PE400 DUAL PURPOSE
RM250D 1983 246 RM250 OFF ROAD
RM250E 1984 246 RM250 OFF ROAD
RM250F 1985 246 RM250 OFF ROAD
RM250-N 1979 246 RM250 OFF ROAD
RM250-T 1980 246 RM250 OFF ROAD
RM250-X 1981 246 RM250 OFF ROAD
RM250Z 1982 246 RM250 OFF ROAD
RM400N 1979 417 RM400 OFF ROAD
RM400T 1980 417 RM400 OFF ROAD
RM465X 1981 465 RM465 OFF ROAD
RM465Z 1982 465 RM465 OFF ROAD
RM500D 1983 492 RM500 OFF ROAD
RM500E 1984 492 RM500 OFF ROAD
RS250T 1980 250 RS250 DUAL SPORT
RS250X 1981 250 RS250 DUAL SPORT
SP400T 1980 400 SP400 DUAL SPORT
X5214F UK UK X5214F UK
The kit that Suzuki43 just put up works out around $81 all up delivered to your door..not a bad price at all