Would appreciate any feedback on the following:

Just got a 2003 Viper convert. It came with 3 new Michelin Pilot Super Sports (PSS) and a moderately more worn rear Pilot Sport.
The car exhibits severe pulling (not sure if its actually tramlining or railroading) at higher speeds when coasting which was determined to be due to the mismatched rear tire.
Problem is, I can't find a rear Mich PSS 345 30 19 anywhere.
If anyone has one to sell, please let me know ASAP. 917-847-2444

On to Plan B which is to replace all tires with PZeros. The Dealer installed a set of run flats rear PZeros (355 30 19) which fit on the stock 2003 rims.
But the car still has a severe pulling that I think is still due to mismatched real Pzeros and front Mich PSS.
I found matching run flat PZeros (275 35 18) for the fronts which I plan to install.

However, I heard Pirelli used to make a Viper PZero (long discontinued) which is different from the regular PZero's.
This is the closest I can come to matching all 4 tires.
Will this solve the pulling problem??

I can't find anywhere 4 matching front & rear viper tires.
I found Mich Sport Cup-2 rears, but can't find the matching Sport Cup-2 fronts.

Any thoughts or ideas?

Thanks,
Mike