Lexus IS steering rack attachment/cross-member insert along with cross-member supports are included in the kit

you can benefit from optional "C6 Rack Offset Spacer Kit" that will allow you to achieve even bigger steering angle on C6 chassis (not needed on C5) and improves the Ackermann curve

this is the solution for you

you can achieve a steering angle of up to 55 degrees

225/35R18)

Concaver CVR4 21x9,5 ET14-61 BLANK Double Tinted Black CB: 74,1 Ventiler Lexus IS steering rack attachment/cross-memberPCD: 5x108, 5x110, 5x112, 5x114. 3, 5x115, 5x118, 5x120, 5x127, 5x130 ET: 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61