914 four bolt pattern Options

[lmcchesney]

I have not found a complete source of accurate information on this topic.
The 914 is listed as having a 108mm four bolt pattern. What measures 108mm?
The offset of my empi's are about 100mm. Is this the true specs?
I have read else where that offset is a incorrect term. My use of offset is the distance from the inner surface of the wheel to the edge of the wheel rim projected down to the center line. Is this correct?
Wheels are measured as 15 x 6.5. How do you measure the with of the rim? Is it from outer (curb surface) to outer or within the bead to bead? If you were to place your ruler on the rims, from what point to what point would you measure?
What bolt dia and length and thread patern are standard? Ebay has a set of bolts that are 2 3/8" or 60mm in length and 1 1/2 inch or 36mm thead length. This allows about 50mm engaged inside the rotor hubs. What length should the bolts be inside the rotor hubs to be safely secured?
Thanks,
L. MCChesney

[Mueller]

since you are running GT flares, you have a few more options for rims than the narrow bodied cars that are still 4x130.....you'd need to find a set of VW Bug wheels, 15x7 and 8's are semi-common in the used department, you might luck out and find some brand new in Hot VW mag or something similar.

another option is to run 4 to 4 adapters, some people don't like these, but if made correctly(hubcentric), they are perfectly safe...you choice now for rims is huge...and the cost of good quality rims is very reasonable....

a few of the GT flared cars that I know of, run 7's in the front with a 1" spacer (23mm rim, but with the spacer, it sorta cancels out the offset, so you could figure it to be a 7" wide rim with 0 offset or ~3.5" backspacing)

for the rear you can go wider...it's a matter of cost and wheter you need or just want wider tires and rims in the back

if you did go with the 4 to 4 adapters, a 4x4.5" bolt pattern would be a good choice,early Mustang 5.0 rims (factory or aftermarket)

if you like the look (they look great on Brett W's car) steel wheels can be had from Diamond Racing wheels in the 4x130 BC in a bunch of sizes and backspacings.