Well I had a top core from a CS and I didn't want to pay a fortune for a front rad (was getting requests around £70-90 quid for a stock one) and wanted a larger one anyway. So I went on the hunt for one and eventually found that, as I'm willing to sacrifice the air con and saved all that weight and space up front, you can fit an Audi 100 main engine radiator in there absolutely perfectly without modification to either...
570x305x42mm twin-pass core. £26.50 new on ebay!
570x305x42mm twin-pass core. £26.50 new on ebay!