Yes, the Wheelbase of 359 (959) is 89.5 inches the same as the original 911/959.
WheelBase of Perry D (550) Spyder is 94.5 inches same as original VW Beetle.
just to be clear. If you purchase a 359 kit and try to put it on a full VW pan the body will be 5 inches too short. You will need to shorten the VW pan by five inches.
This is why the advertiser of the red car above says that it uses a shortened VW pan.
Also, if you look closely, at the specs at the bottom of the "Best of Both Worlds" manufacturers advertisement on the second page of this thread you will see it says Wheelbase: 89.5 inches.
BTW, I do like the Perry D Spyder very much and after rebuilding a Beck 550 and driving it I hated how tiny the cockpit was and wished you could put the seats back further. The Perry D includes this much needed space. Especially, for big guys. That's my daughter in the Beck 550!