Since my car is now over 27yrs old and has only had one cambelt change (mileage is still low so not a great risk .... ) I started looking for replacement belt and tensioner at the end of last year.
As far as I can make out, the belt is effectively unique to the Cappuccino, no other application seems to be listed for the particular size. The tensioner is used on other engines, particularly the Suzuki Wagon R and Chevrolet/Daewoo Matiz and Kalos.
In the UK the tensioners are readily available from various sources, with a variety of brands. I went direct to the online SKF shop https://vehicleaftermarket.skf.com/uk/en , you can find cheaper alternatives if you search but I felt happy going to the manufacturer (actually purchased from the SKF ebay shop, but same source). I trust SKF quality, I regularly use their bearings in motorcycles etc.
SKF part number VKM 76102
Belts are a different case. I know Gates from time in industry and similarly trust their quality, providing it is indeed a genuine Gates product. There are plenty of fake items around, just like fake NGK etc. Gates give a guide of how to check the item. The Gates belt is part number Powergrip 5642XS.
While there are quite a few places which advertise them, it turned out that no-one actually had any stock. One place was very helpful and checked likely delivery, quoting sometime in Q1 of 2023. I started checking and found that the various "stockists" did indeed show availability, but interestingly every single one showed 2 available. My guess is that they all use the same wholesaler and all refer to that stock. I purchased one from a reliable source and it does appear to be genuine. The ebay suppliers seem to show various stocks now so maybe a few more have filtered through the supply chain. The belt I have says "made in UK" on it.
The alternative belt which was available was sold as "Quinton Hazell", which used to be a well known UK parts brand, but as I understand it that brand name was bought up by an intermediate supplier and the items can be made by pretty much anyone anywhere in the world, so there is no guarantee of quality.
As the weather warms up here in the UK I'll soon get out to the garage and fit the items, hopefully all will be well.