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Need Bath Replacement and general resealing :)

We have a small bathroom with a shower/bath combo. The bath and seals are very tired and we would like to replace the bath and seals. The paint is coming away from the bath. We need help sizing the bath so we can buy a new one (would also appreciate help finding a new bath) and then with removal of old bath and instalation the new and general re-sealing of the area. So I guess there will be some plumbing also.