98/98.5 SVT has a SH UIM
99/00 SVT had a DH UIM
98/98.5/early 99 SVT had a 31mm/32mm LIM
late 99/00 had a 33.5mm/35mm (3L) LIM... ...as does YOUR 01 Cougar!
DO NOT downgrade to the smaller "early" SVT LIM.
There is no need to upgrade your injectors just to do it. You would need to be around 170 FWHP or better to be "needing" the 19lb injectors.
Also if you are going to upgrade to the DH UIM you should definitely get the SVT TB and associated parts needed for install.
