Tube sizes for stock tires

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Hey everyone..new guy here. Experienced rider myself (Own a VTX1300 cruiser) but recently picked up a GZ250 for my wife to learn on, never having ridden before.

Getting it ready for the season it's clear it needs new rubber. Have decided on sticking with the stock tire sizes, opting for Shinko's, the reviews indicate a good combination of value for the dollar, and if I only get a season out of them, so be it.

Problem I'm having is finding tubes. On this side of the border (Canada) a lot of tubes are listed in metric, some not. Doing the conversion and based on what I've read online confuses the matter more.

So, can anyone tell me if these combinations will work?

Front stock tire 110/90-16, tube (metric) 4.25/4.60-16?
(According to this website, that tube will fit that tire..but still questioning it)

Rear stock tire 130/90-15, tube 140/90-15?
Yes, 130 vs 140, but again, data I seem to be able to find indicates it'll work?

The exact matches simply don't appear to be available up here (and typically hard to find anywhere anyways?) but much Googling and such (including a few threads here) seem to suggest those are combinations that will work.

Advice appreciated.