hey welcome aboard. i believe i have heard your dads name from around somewhere, probably the MX5 Club wesbite. why don't any of the official members hang out here??
ah wait!, it was your dad that had the 12AT rotary engine MX-5. it was sold to Duj here (not so active anymore) & then sold to lil_mike (also on here) in Brisbane.
anyway, it looks good. luckily not one of the white ones that had paint flaking problems. mines an 89 (the original!) as well, but with 266,000Ks & then the head went bang. now with a 33,000K NB6 engine

if it's only the rear window that needs replacing & the rest of the top is ok, Wilshire Motor Trimmers can replace just the rear plastic window (& do patch jobs on any rips in the top if you want). there the place i went to, to replace my whole softtop with a glass windowed version.
check out the Events section for SA, theres a cruise & lunch happening out at Victor Harbor soon. & join the SA mailing list to be kept up to date with SA events.