Went through same thing two weeks ago. Wanted an aluminum or good three row, but could not find one with the 4 oil/trans. cooling connections, metal side tanks (be careful, some are plastic!) &/or that didn't cost a small fortune.
After lots of looking, solution was cheap & easy. Local shop replaced the core with same type core & used the original tanks, only $110. Looks new & original, & seems to work great, I'm here in central Ca. where commonly 90* or more & no overheating.