well seeing as there was no response i found a metric ruler I had laying around and measured my lamps 37 MM then ordered them correspondingly,
got them from Superbrights and took a housing I have here and did a test sizing before I opened the bag and found I got it right,
btw I did order the 6 panel light (3710 WWHP6) and it does fit in the area between the clenches perfect, so dont order the 44MM 8 panel light it wont fit!
since my current lens has a burn in it and is cracked I ordered a new one from the stealership, (GM part number 16520288 for ext cab models and only $22 w tax, about $12 cheaper than one found on ebay!) it should be here Tues since it had to come from Reno
when I get the new lens I will put them in and get some pics on here