QB do a fibreglass seat which is what I used...although its cack quality and youll need to spend hours prepping/cutting/sanding !! (fortunatley my painter is an absolute perfectionist and it came out no different to an OE unit !!!) you can mod it to fit the strada subframe..but youd be daft not to take that SP0 one of Rob coz it will save you loadsa hassle !!!
A few pics for reference if it helps..
Nat