Clearance problem with rear disc brake and 15'' wheels / Barracuda 69

Hi All, I've helped my friend to install a DBK 834 rear disc brake kit on his 1969 Plymouth Barracuda, before we order the kit, we were inform that works with minimum of 15'' wheels
we have 15'' Rallye wheels. We install the kit, the job is done. But when we put wheel in place : clearance problem at the back (of the back) of the wheel rub and is in contact with the caliper :(
Did someone has this problem ?
the 69 Cuda is still is 4'' bolt circle pattern and we didn't have found Rallye wheels in 16''
the wheel choice is limited in 4''
If you have ideas to find :
- Rallye wheels in 16'' or Aluminium looks like Rallye wheels with 4'' bolt pattern
- Not drilled wheels and machined in 4'' bolt pattern

Thanks
Lio

DBK-834.jpg

wheels-front.jpg

wheels-back-1.jpg