Dear Welder Series…
Hello, I was looking at your Mustang II crossmember kit. I’d like to get one for my Datsun 521. I was wondering if you would be able to decrease the width of the crossmember sections by 3” to accommodate the more narrow track width of my truck. I guess I could section it myself but that wouldn’t look as clean. The suspension parts aren’t readily available for my truck so I’d like to use this setup.
Thanks,
John

Dear John…
Hi, John.

We can make special width crossmembers, but…

The actual track width might not turn out to be what you hoped for. The brake kit used can move the wheel in or out from where the stock Mustang II was. You might also find that narrow control arms can be used that will reduce the track width and give more clearance in the engine room for exhaust and steering, even if you will use the stock engine.

Our website has some Mustang II dimensions at http://welderseries.com/tech/tech-sharing/ifs-make-your-own/. These dims will give a track width of 56-1/2” when stock 1974-78 Mustang II rotors and control arms are used. Narrowing the dimensions, top and bottom, will bring the wheels closer together by that amount. Shorter control arms will do the same. The brakes used might move the wheels in or out. We have info about our brake kits at:

If you use 4-bolt MII rotors, there should be no change.

My suggestion is:

Get everything you need except the crossmember kit, springs, shocks, and the steering rack. (Wheels & tires, brakes, spindles, and control arms)  A custom rack will have to be ordered after the width has been determined. Springs and shocks can come after that.

Remove the stock front suspension.

Block the truck at ride height.

Mock up the wheels & tires, rotors, spindles and lower control arms.

Position the tires in the fender. The tires should be very close the vertical.

Block the lower control arms at horizontal.

Measure the lower control arm mounting hole center-to-center.

Subtract that dimension from 22-1/4”. This is the amount to remove from the crossmember.

Buy our 56-1/2” kit and remove that amount from between the rack mounts.

The rack will have to be shortened the same amount.

Before doing much more, check the cost of this to be sure you are comfortable with it.

I hope this helps with this part of the project.

Paul Horton