Just the day I leave my tyre size spec sheets at home !
Anyway - I'm pretty sure that the original tyre size on a TA22 is 155/82R13 and those 185/70R13's you have are what have since been fitted. The TA22 ST and GT models in overseas markets had wider tyres of a lower profile than what we got on the TA22 LT that was sold here in Australia, but I can't remember the exact sizes at the moment.
I believe that as long as you can prove that the replacement rim is no more than 1 inch greater in diameter and up to no more than 7 inches wide, and your track is not increased greater than 25mm over original, and your new tyres are close to the overall diameter of your original tyres then you should be OK.