need to know for body lengthning project thanks

my 81 narrow track is 81 inches in my haynes manual, but measures 79 inches IRL

'72 or '73 and older are 81" the newer ones are 84".I am bumping my '79 out to 97".3" longer than a 7.Blazin:D

'71 7 older = 81"
'72 & newer = 83"

Bantam - 78.5"
pre-50's Willy's - 80"
m-38--------------80"
m-38a1-----------81"
m-170-------------101"
m-715
m-725
m-729-------------126"
'55-'71, cj5-------81"
'55-'71,cj6--------101"
'72-'86,cj5--------83.5"
,cj6--------103.5"
, cj7--------93.5"
,cj8---------103.5"
4x4 willys wagon-----104"
4x4 willys truck--------118"
fc150----------------81"
fc170----------------103"
'63-'70, wagonner-------110"
, gladiator truck----120"/126"/132"

'67-'71 Jeepster Commando---101"
'71-'73 " '" ---104"

'71-91" Wagoneers---------------109"
'71-'87 J-trucks---------------------119"/131"
XJ--------------------------------------101.4"
MJ--------------------------------------113" shortbed
119.9 longbed
ZJ---------------------------------------105.9"
WJ--------------------------------------105.9"

YJ---------------------------------------93.4"
TJ----------------------------------------93.4"

thanks guys i am looking at gooing arround /100/ with lengthing the cowl and the door and using a tubed front end do any of u have pics of cj5s lengthend