Stock fittings, block and oil cooler - 1 1/14"
Stinkers fittings - 1"
Very easy to get to if you take off the passenger wheel and fender liner. Use a pick or small thin screwdriver to pry off U shaped retaining clip under black dust cover on stock lines. Remove the clip and just pull out the quick connect lines. (Do one line at a time so you remember where each line goes from block to cooler) Have a pan under it, some oil will leak out and also be in the lines so drop them in the pan when removed. Stock fittings are 1 1/4" and Stinker's fittings are 1". I happened to have deep sockets that big and it made life much easier. Would have been tough with an adjustable wrench to get at the fittings on the block.
Get the lines and stop fooling with the stock ones. The last set I had was the supposed fixed ones via a TSB. Lasted about 10 months. Good fix!!!
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2005 Silver QC