I need a heater core with 2 different hose sizes for my 68 Barracuda

i have a 74 duster that i got a used one out of a 71 4 door valiant that has one 1/2 and the other 5/16, i pulled the motor out of a 71 challenger with a 318 that had the same arrangement for the heater hoses, what i run into was the heater cores that i were finding is the copper tubing was a little longer on some than the other and some had 90 degree turns from the core to the firewall. I think some were different according to A/C . If you can put a photo on here i have a spare that i will give you if it will work, it will need to be test for leaks, but it would'nt fit a 74 non a/c duster, the part number on it is 764183981605 stamped on the bottom of copper core, the other one has longer tubes that has the same size hoses , the part number is stamped on flat metal bracket that the core is soldered to has a number between the hoses ,top number 36086 and has 2235 stamped below it and has longer tubes than the other, its identical to the one i used i , if either will work for you all it will cost is shipping.They have been in my shop since summer and i need to clean out some parts.