If your sheet metal is good, you can make your own tubs.
Check this out.
http://www.totalcostinvolved.com/ass...o_Mini_Tub.pdf
They are not quite as wide as the DSE mini-tubs, and require a bit of fabrication, but I've seen this method used on two other cars here in the Bay Area. Again this depends on how good your existing tubs, inner and outer are, and how good you are with sheet metal work. Not sure you can get 335's without notching the frame rails, which is shown, however the DSE instructions on notching and patching the frame rails is better than what is shown in this link. I don't have the CD that came with the DSE mini-tubs, otherwise I'd shot you that file. Contact DSE and see if they will email it to you.