You can give Griffin Radiator a try. They offer double pass and cross-flow in an "LS" configuration with top inlet and bottom, both on passengers side. 800-722-3723 or
www.griffin rad.com
Eastwood is selling cross-flow as well. I guess, If you want it, someone sells it.
Good hunting and best on your project.
Side note, guy bragging: I was a service manger at a marine dealer with many lines, but the premier fiberglass line was Sea Ray up to 32ft. On my way to the front office, I noticed an older guy looking over a 32ft w/twin 7.4L, generator, everything. It's not my job but asked if I can help. He asked some good questions.
Then after 30 minutes, I excused myself.
He said; "I've made good money and found one truth in life...We (Us Guys) want everything bigger, our car, our house, our boat, my wallet, the garage, hell...even my wife's bra. The one truth is we want everything bigger
except the wife's ass"