Jim
I have 3 rims; a bit rusty but your welcome to them. How can you tell I they are LWB or SWB?
D
There are loads of variables but basically Series SWB rims are 5" wide across the inside of the rims, Series LWB rims are 5.5" wide across the inside of the rims, some early LWB ones carry the extra width on the inside of the rim, later ones on the outside of the rim WRT the centre plate.
HTH