400 rear plastic with a 300 seat???

[Pvt. Maggot]

hey, i was wanting to do this but what would i have to do...i have a pic of it done...any info would be great:D

[killed300ex]

you sure thats not a 400 ex seat cause i think it looks like a 400 seat and i dindt think there was a way of doing it with a 300ex seat
killed

[Pvt. Maggot]

yes..compare these too..this is a 400 seat