I am a consultant for variuos radiator manufacturers and am on the look out for the following aluminium tube sizes: oval tubes16 x 2 x0.25 24 x 2x 0.3 32 x 2 x0.29 oil cooler tubes 46 x 4 x 0.5 66 x 4 x 0.5CAC tubes 40 x 8 x 0.5 62 x 8 x 0.5 74 x 8 x0.5 the most urgent sizes are the 46 and 66. Please feel free to contact us.