Recieved my strap this morning.
Ordered the black one.
The seller messaged me to tell me he was waiting for some material supplies, apologised & offered to refund or provide another half price so I snapped up the half price deal with a red & black strap.
Glad I did, the quality is excellent & the leather looks (and smells) really nice. Stitching is nice & the fit is perfect as when you order he requests the circumference of your wrist so it's a custom fit.
You was right, the strap would not fit with the stock spring bars but luckily the seller provides 2 slightly curved bars with each order which allowed the slightly thicker leather to fit snugly.