Personally I'd take the pads back if you can, the new lines should be alright to connect to the thou caliper. You should be able to get one for £40-50 off ebay.
I replaced the lines and seals on my old caliper and it'd seized up again within a few months. I did the upgrade and it feels like a different bike, well worth the money.
Like I say, I'll have a look when I get in and let you know.