I bought boot kits from my local Auto-One store. They had them for Commodore and Ford axles but they seemed to be fairly universal. You probably just need to check the diameter of the CV outer and the diameter of the axle. They are stretchy rubber so could probably fit a variety of axles/CVs.
Take one of your axles in there and measure them or they.
A quick search on eBay and I see you can buy a whole new CV with boot kit for $49
CV JOINT NISSAN SKYLINE R32 | eBay
Cheers