ac evaparator problems

Hi . Iv'e got a 79 malibu and my mechanic is getting the ac up and running . I got this evaparator from rock auto ; FOUR SEASONS 54277 . it is listed for just about every g body . According to the mechanic it doesnt fit and he's going to half to modifiy the box to make it fit . I have had problems with cheep chinese crap in the hobby business :evil: ,but does this sound correct ? I trust the guy ,he has owned a G body race car and is a true work on anything type of guy .

I need a soultion an or confermation quick befor the choping starts !
Thanks a lot : Bill

Ok then These are the problems :

1- The evaparator is exactly the same size when measured ,connections in correct places . The only differance is the number and placement of the ridges on the top and bottom of the evaparator. ... Solution some cutting on the box, there's 2 wedges one on top and one on bottom that need to be trimed , then it fits . They picked up evaparators from two other sources exactly the same !

2- drier ; Exact fit driers are no longer available so a "universal" one is supplyed .Fit is done by suppling 3 different tubes to make fit , stillsome bending is needed.

3- Compressors ; they all seem to be supplyed with metric screws so if you have an inch car look forward to some tapping and other fun !

The only reason I went to the trouble of doing this is I'm moving to Fla. and the thought of havijng a BLACK car without AC was not possible ! Us old farts need our comfort!!!

Thanks Bill