Re: el xr8 wheels
outback_ute is right, EL1 came with 15's standard, but the 5 spoker 16's were optional (as they were with the EF). EL2 got the 16's standard.
As said, they are available as copies in both 16 and 17, I believe they are made by ANZ.
Check out the marketplace, since they go occasionally. Brand new, I wouldn't pay more than $1600 with tyres ($1700 will get you 17" EL-GT copies with tyres).
Second hand, obviously less (seen them for around the $1000 or less, with varying degrees of rubber). They can be tricky to find, I looked for a year, before giving up and getting EL-GT's. As usual, about 3 sets were advertised about a month after putting on the new rims. . .