Does size really matter? My project is restoring the AC system on my 1996 Suburban K2500 4X4 big block. I going to be replacing some hoses, the accumulator, etc. My present accumulator is about 8-1/2 inches long; and all the parts places, including General Motors, come up with one about 7-1/2 inches long. In attempting to research the correct part, I've seen specs showing that there two accumulators for the Suburban, one being for a vechicle with rear air, which is what I have. Additionally, the current accumulator sticker says add 4 lbs of 134A, and the replacements that I've been given say 2 lbs. of 134A. I've been to about 7 supply/parts places, and they all say the smaller accumulator is the correct part. Is the size of the accumulator actually significant? Please advise. Thanks.