Here we go courtesy of a post Mr. John Hertog made on 6/28/2000: Hi Jeff, It's nice to be getting back to tech e-mails. You're quite right that there are two different shape windshields. They are usually referred to as 'straight' , and 'bubble' . The W590 is the "bubble" windshield . It was used in ALL 1960 Chryslers. Then, it was used in ALL 1961, 1962, 1963, 1964 Chrysler CONVERTIBLES , only. The W604 is the "straight" windshield. It was used in all hardtops starting in 1961. For the purposes of this discussion, I will only talk about Chryslers, even though it's pretty much the same thing for identical bodied Plymouth, Dodges and DeSotos. Both windshields WILL interchange. BUT, a little known fact which I have picked up on is that the gaskets are different, from one model to another. The straight windshield uses gasket # 2166675 . The bubble windshield uses gasket # 1882146 (check out parts books under 23-66-0 ) . It is my opinion that different gaskets were used because of the different angle at which the windshields come in at the top. Hope this helps John ----- Original Message ----- From: jeff shenk > all; > does anyone know about the 2 different shape windshields that fit > the 64 chryslers? > i have a 300 that has a standard w/sh, it goes straight down from > top edje to bottom and on the 300K i have a w/sh that goes about 4 > inches out then bubbles down to the bottom, has a large bubble in the > top of it and side by side its very obvious that they are entirely > different w/sh's. ive been looking and only found one other like it > since i got the car in 84, it was in a n/y'er, of all things. anybody > got a clue; who is supposed to be the resident 64 expert anyway, i ought > to ask him i suppose.. Thomas F. Miller tfm@xxxx 614.975.4164 voice/page 707.667.2601 eFax