Tasmin brake upgrade

[teba1330]

I have sourced parts to do Austin Pri1ncess caliper upgrade to my 82 Tasmin coupe. Measuring wheels and size of calipers ,it seems as if wheel needs to be larger than standard 14in. Given that original wheel is 112,5 with 23mm offset, then 350i 15 in rims should work ? Opinion seems to vary 16in have been suggested but wheels with 23mm offset and 112 pattern aren't easy to find here in Canada.
Thanks for any advice.

robert