Look for 15x7 wheels, offset 40-45mm, 195/50 15 tyres.
Mk2 15" wheels are a very good choice,
Its going to be hard to find 45mm offset aftermarket wheels; all of the factory 15" wheels for the Mk1 were 45mm, and they are generally rare to find. The Mazda UK distributor put on various 15" wheels that didn’t conform (high 30s offset). Mk2 14" wheels are 45mm offset, but 15" factory Mk2 are 40mm offset.
Weight wise, most aftermarket 15" wheels are “ok” falling into the 14-15lb range. The Mk2 15" wheel is a decent weight at 13lbs, and rare BBS factory are 12lb. The 14" BBS factory is the lightest of them all, but you will have a job finding a complete set with the centres.
I have an original set coming up for sale shortly, centres all present and with new tyres fitted. Anyone interested can PM me or the advert will be up in the next couple of weeks.
The selection for 15s is great I find, for a normal (“normal”) width of 7j ish then my go to was always ps3’s, they used to be 45 a corner from camskill but I haven’t looked in a while but they’re an excellent staple
The selection for wider 15" tyres gets a bit thinner, I’m currently on proxes tr1’s their newer design and so far so good on 225/40(45?)/15
But for track wheels I’m on ao48’s on the 7j ultralageras
If weight is a factor then probably best looking aftermarket, both of my sets are 4.9k a corner before tyres (8j et25 rpf1’s - perfect fitment and 7j ultralageras - look tremendous and have my track tyres on but they don’t look as good fitted due to needing spacers)