i e-mailed this question to insulco the other day. as it turns out they make an equivalent to owens corning 703 under license.
actually, this is from the e-mail:
"Yes we do make the Rigid glasswool product made under licence from Owens Corning.
It is 48kg/m3 and comes in sheets 1200mm x 2400mm in 25, 50 & 75mm thick.
The closest distributor to you is Avant Garde Insulations at 3/61 Norman St, Peakhurst. Ph 9534-5366"
you may want to contact them for distributors close to you.
cheers,
glenn